The weather is expected to improve so that the multinational search being conducted out of Perth, Australia, could possibly resume Wednesday. But even then, the searchers face a daunting task of combing a vast expanse of choppy seas for suspected remnants of the aircraft sighted earlier.
| Furious that Malaysia has declared their loved ones lost in a plane crash without physical evidence, Chinese relatives of the missing marched Tuesday to the Malaysia Embassy, where they threw plastic water bottles, tried to rush the gate and chanted, "Liars!"
The Chinese government, meanwhile, demanded that Malaysia turn over the satellite data it used to conclude that Malaysia Airlines Flight 370 went down in the southern Indian Ocean with no survivors after turning back from its flight path to Beijing on March 8.
Among the flight's 239 passengers, 153 were Chinese nationals, making the incident a highly emotional one for Beijing, and the government's demand reflected the desire among many Chinese relatives of passengers for more conclusive information on the plane's fate.
Nearly 100 relatives and their supporters marched to the embassy in the late morning, wearing white T-shirts that read "Let's pray for MH370" as they held banners and chanted for about three hours.
"Tell the truth! Return our relatives!" they shouted. There was a heavy police presence at the embassy, and there was a brief scuffle when some relatives tried to get past police to approach journalists, but no effort was made to break up the demonstration. The group presented a letter of protest to the embassy before getting into several buses and departing.
Many of the relatives maintain they are not being told the whole truth - a not-uncommon mindset among Chinese accustomed to dealing with authorities in their own opaque, single-party communist state. Though some have expressed resignation that their relatives probably are dead, they have accused Malaysian authorities of foot-dragging and withholding information early in the search, when there might have been some chance to save the plane.
"I want the truth, and I believe they have been hiding some information from us," said Wang Zhen, who was not part of Tuesday's demonstration but whose parents were aboard the missing plane. "It remains an enigma as to what happened after the plane turned around. What happened when the plane continued to fly?
"I am still hoping for my parents' return, even though I understand the probability is very, very low," Wang said in a telephone interview.
Deputy Foreign Minister Xie Hangsheng told Malaysia's ambassador to Beijing that China wanted to know what exactly led Malaysia to announce Monday night that the plane had been lost, China's Foreign Ministry said on its website Tuesday.
"We demand the Malaysian side to make clear the specific basis on which they come to this judgment," Xie was quoted as telling Datuk Iskandar Bin Sarudin.
There was no immediate response from the Malaysian side.
The flight vanished less than an hour into an overnight flight March 8 from Kuala Lumpur to Beijing.
In Monday night's announcement, Malaysian Prime Minister Najib Razak said that an unparalleled study of the jet's last-known signals to a satellite showed that the missing plane veered "to a remote location, far from any possible landing sites."
The conclusions were based on a more thorough analysis of the brief signals the plane sent every hour to a satellite belonging to Inmarsat, a British company, even after other communication systems on the jetliner shut down for unknown reasons.
Malaysia Airlines on Tuesday said it was doing everything possible to help the families, and defended itself against criticism over how it informed them about the government's conclusion that no one aboard the aircraft is still alive. Some relatives were informed by text message.
"Our sole and only motivation last night was to ensure that in the incredibly short amount of time available to us, the families heard the tragic news before the world did," CEO Ahmad Jauhari Yahya said.
"We know that while there have been an increasing number of apparent leads, definitive identification of any piece of debris is still missing. It is impossible to predict how long this will take," he said. "But after 17 days, the announcement made last night and shared with the families is the reality which we must now accept."
Monday's announcement sparked mournful, angry and chaotic scenes at the Beijing hotel where many relatives had gathered. Around 2:00 a.m. Tuesday (1800 GMT Monday), a group of family members read out a statement accusing Malaysia Airlines and the Malaysian government and military of procrastination and cover-up.
"Such despicable acts have not only fooled but devastated - both mentally and physically - the family members ... but also misled and delayed rescue operations, wasting huge amounts of human power and resources and forgoing the most critical rescue opportunities," the statement said.
Tuesday's demonstration at the embassy is unusual for China, where authorities typically clamp down firmly on spontaneous public gatherings that have no prior permission, especially those that escalate into anti-government protests.
The government's acquiescence Tuesday shows a double standard on people's right to assembly, said Beijing lawyer Zhang Qingfang, who represented a prominent activist convicted of disrupting public order after he organized small peaceful rallies demanding education equity and cleaner government.
"The logic, I think, is that as long as it's directed at the Japanese government or the Malaysian government, it is OK, but it shall not be tolerated if it's directed at the Chinese government even if the demands are reasonable," Zhang said. "We still agree the family members have every right and freedom to express themselves, but it is a shame for the government to have such double standards. This goes to show China is not a country of law," he said.
Calls to the news office for the Beijing Public Security Bureau were unanswered. The police also did not respond to a faxed request if the family members had obtained police permission.
Nan Jinyan, sister-in-law of Flight 370 passenger Yan Ling, said she suspects Malaysian authorities knew for a long time that the plane went down in the Indian Ocean.
"I feel like they are toying with human lives," Nan said. "What else can be more important than human lives?"
"I don't think there's any shred of hope for him to return," Nan said of her brother-in-law. "We are exhausted after all those days, and I think we are all at loss as to what to do. We have never been through anything like this, and we have no direction."
"We're not searching for a needle in a haystack - we're still trying to define where the haystack is," Australia's deputy defense chief, Air Marshal Mark Binskin, told reporters in Perth at a military base as idled planes remained parked behind him.
HEAR The Australian News Conference
In remarks to the Malaysian Parliament, Prime Minister Najib Razak also cautioned that the search will take a long time and "we will have to face unexpected and extraordinary challenges."
Late Monday, Najib announced that the Boeing 777 had gone down in the sea with no survivors. But that's all that investigators and the Malaysian government have been able to say with certainty about Flight 370's fate since it disappeared on March 8 shortly after taking off from Kuala Lumpur for Beijing.
Left unanswered are many troubling questions about why it was so far off-course. Experts piecing together radar data believe the plane back-tracked over Malaysia and then traveled in the opposite direction to the Indian Ocean.
Investigators will be looking at various possibilities including possible mechanical or electrical failure, hijacking, sabotage, terrorism or issues related to the mental health of the pilots or someone else on board.
"We do not know why. We do not know how. We do not know how the terrible tragedy happened," the airline's chief executive, Ahmad Jauhari Yahya, told reporters.
Monday night's announcement unleashed a storm of sorrow and anger among the families of the plane's 239 passengers and crew - two-thirds of them Chinese. Family members of the missing passengers have complained bitterly about a lack of reliable information and some say they are not being told the whole truth.
Nearly 100 relatives and their supporters marched on the Malaysian Embassy in Beijing, where they threw plastic water bottles, tried to rush the gate and chanted, "Liars!"
Many wore white T-shirts that read "Let's pray for MH370" as they held banners and shouted, "Tell the truth! Return our relatives!"
There was a heavy police presence at the embassy and there was a brief scuffle between police and a group of relatives who tried to approach journalists.
Deputy Foreign Minister Xie Hangsheng told Malaysia's ambassador to Beijing that China wanted to know exactly what led Najib to announce that the plane had been lost, a statement on the ministry's website said.
Malaysia Airlines Chairman Mohammed Nor Mohammed Yusof said at a news conference Tuesday that it may take time for further answers to come clear.
"This has been an unprecedented event requiring an unprecedented response," he said. "The investigation still underway may yet prove to be even longer and more complex than it has been since March 8th."
He added that even though no wreckage has been found, there was no doubt it had crashed.
"This by the evidence given to us, and by rational deduction, we could only arrive at that conclusion: That is, for Malaysia Airlines to declare that it has lost its plane, and by extension, the people in the plane," he said.
The conclusions were based on a thorough analysis of the brief signals the plane sent every hour to a satellite belonging to Inmarsat, a British company, even after other communication systems on the jetliner shut down for unknown reasons.
The latest satellite information cannot provide an exact location but just a rough estimate of where the jet crashed into the sea.
Although there have been an increasing number of apparent leads, there has been no definitive identification of any debris.
On Monday, Australian and Chinese search planes said they had spotted floating objects in an area 2,500 kilometers (1,550 miles) southwest of Perth, but none were retrieved. Now, with the harsh weather and a 24-hour delay in the search, those objects and other possible debris from the plane could drift to an even wider area.
The delay will also make it harder for investigators to forensically track back where the plane hit the water if they do find some debris, said Erik van Sebille, an oceanographer at the University of New South Wales in Sydney. The swirling and unpredictable nature of currents can spread items that begin in the same place hundreds of kilometers (miles) apart within weeks.
"It's like one giant pinball machine out there," he said.
Also, there is a race against the clock to find any trace of the plane that could lead searchers to the location of the black boxes, whose battery-powered "pinger" could stop sending signals within two weeks. The batteries are designed to last at least a month and can last longer.
Several countries had already been moving specialized equipment into the area to prepare for a possible search for the plane and its black boxes, the common name for the cockpit voice and data recorders - needed to help determine what happened to the jetliner.
An Australian navy support vessel, the Ocean Shield, equipped with acoustic detection equipment, was expected to arrive in several days in the search zone. And the U.S. Pacific Command said it was sending a black box locator to the region in case a debris field is located.
The U.S. Navy has also sent an unmanned underwater vehicle to Perth that could be used if debris is located, said Rear Adm. John Kirby, a Pentagon spokesman. The Bluefin-21, expected to arrive in Perth on Wednesday, has side-scanning sonar and what is called a "multi-beam echo sounder" that can be used to take a closer look at objects under water, he added. It can operate at a depth of 4,500 meters (14,700 feet).
Australian Prime Minister Tony Abbott said he had spoken to Najib to offer help with the ongoing search and investigation.
"What up until now has been a search, moves into a recovery and investigation phase," Abbott said. "I have offered Malaysia, as the country legally responsible for this, every assistance and cooperation from Australia."
The search for the wreckage and the plane's recorders could take years because the ocean can extend to up to 7,000 meters (23,000 feet) deep in some parts. It took two years to find the black box from an Air France jet that went down in the Atlantic Ocean on a flight from Rio de Janeiro to Paris in 2009, and searchers knew within days where the crash site was.
"We've got to get lucky," said John Goglia, a former member of the U.S. National Transportation Safety Board. "It's a race to get to the area in time to catch the black box pinger while it's still working."