Hotel workers put out candle lights dedicated to passengers onboard the missing Malaysian Airlines flight MH370 after the prayer for the passengers was finished at a hotel in Beijing March 20, 2014. The FBI is helping Malaysian authorities to analyse data from a flight simulator belonging to the captain of a missing Malaysian airliner, a US official said on Wednesday as investigators grasped for clues 12 days after the plane vanished. The words on the board read "praying for the safe return of family members". [Photo/Agencies]

Special: Malaysian Airlines jet missing