Authorities have revealed the last communication from Malaysian Airlines flight MH370 before it disappearance earlier this week.

In response to a message from Malaysian air control the plane responded “All right. Roger that” suggesting everything was normal on board the aircraft.

The plane, which has 239 people on board, has been missing since Saturday when it disappeared over the South China Sea.

The search has been widened to waters off both sides of the Malaysian peninsula as Chinese authorities push for the aircraft to be located.

The aircraft vanish about an hour after it took off from Kuala Lumpur International Airport, as it flew over the South China Sea, on route to Beijing.

No distress signal or message was sent.

As the plane reached the boundary between Malaysian and Vietnamese airspace, the Malaysian air control announced it was handing over to Ho Chi Minh City Control.

Minutes later, all contact with Flight MH370 was lost.

Malaysian authorities on Wednesday requested assistance from India in searching the Andaman Sea, north of the Malacca Strait.