Before I hand over to Matthew Weaver in London, here are the latest developments in the ongoing search for flight MH370.

Malaysia Airlines flight MH370 is still missing , some five days after it vanished in the air near Vietnam.

, some five days after it vanished in the air near Vietnam. The Wall Street Journal is reporting that U.S. investigators suspect the aircraft may have kept flying for about four hours after it disappeared from civilian radar on Saturday morning Malaysia time.

after it disappeared from civilian radar on Saturday morning Malaysia time. If their suspicions are correct, the plane could have travelled far beyond where the search is currently focused.

where the search is currently focused. Malaysian and Vietnamese aviation authorities have flown over the area where Chinese satellite images earlier showed mysterious debris - both say that no trace of the missing flight was found.