Multinational rescue teams were scouring remote seas in the Indian Ocean to trace the missing Malaysian plane carrying 239 people on board, as the desperate search for the jet entered its third week on Saturday.
Malaysian authorities on Wednesday said some files were found deleted from the flight simulator found at the house of the pilot aboard the missing jetliner and experts are trying to retrieve the data that could be crucial for solving the aviation mystery.
Pass holders would be allowed to work without any employment restrictions for five to 10 years.
China is scouring its territory in Tibet and Xinjiang for the Malaysian jetliner missing for 11 days, a senior diplomat said as international efforts to locate the plane failed to achieve any breakthrough.
A robotic mini-submarine deployed to unprecedented depths has searched approximately 50 per cent of the focused underwater area of the Indian Ocean floor, as it ended its seventh mission on Sunday with still no sign of wreckage of the missing Malaysia Airlines plane.
China on Thursday said it would not give up its efforts in searching for the missing Malaysia Airlines plane after its satellites spotted three floating pieces of possible debris in the South China Sea between Malaysia and Vietnam.
Autonomous underwater vehicle Bluefin 21, a US Navy probe equipped with side-scan sonar, has focused the search on an area in the southern Indian Ocean where four acoustic signals were detected that led authorities to believe that the plane's black box may be located there.
A mini-submarine deployed to find the crashed Malaysian jet has touched record depths in the Indian Ocean beyond its operating limits and embarked on a fifth mission on Friday, with still no sign of the plane's wreckage.
A Chinese patrol ship searching the crashed Malaysian airliner on Saturday picked up a pulse signal from its black box detector in the southern Indian Ocean, China's official media reported, in a possible breakthrough in the nearly month-long multinational hunt for the jet.
Multinational search teams were racing against time to locate the black box of the crashed airliner, as Malaysia revised the account of the critical final communication received from the jet.
Suspected floating debris of the Malaysian jet may have sunk in a remote part of southern Indian Ocean as a multination team failed to spot them, dashing hopes of a breakthrough in locating the aircraft which mysteriously disappeared two weeks ago.
The search for the crashed Malaysian jet on Friday dramatically shifted to a new area 1,100 km further northeast in the Indian Ocean after authorities received "the most credible lead" of radar data suggesting the plane flew faster and ran out of fuel more quickly than estimated.