Missing Malaysia Airlines plane 'may have turned back'

Search teams are still trying to establish what happened to a Malaysia Airlines plane that disappeared south of Vietnam with 239 people on board.

Radar signals show the plane - Flight MH370 from Kuala Lumpur to Beijing - may have turned back shortly before it vanished.

Malaysian officials say they are now investigating the identities of two passengers, who were flying on stolen passports.

John Sudworth reports from Beijing.