Indonesia has asked the United States for help in locating the AirAsia jet that went missing on Sunday carrying 162 people, the U.S. State Department said Monday.

¡°Today we received a request for assistance locating the airplane, and we are reviewing that request to find out how best we can meet Indonesia¡¯s request for assistance,¡± State Department spokesman Jeff Rathke told a regular news briefing.

Rathke said the Indonesian request was made via a diplomatic note to the U.S. Embassy in Jakarta. He declined to give details of the request.

¡°Our embassy, of course, is focused on finding ... ways to be responsive. Of course, we¡¯ve been in close contact with Indonesian officials since the disappearance of the plane,¡± Rathke added.

The Indonesia AirAsia plane, an Airbus A320-200, disappeared after its pilot failed to get permission to fly higher to avoid bad weather during a flight from the Indonesian city of Surabaya to Singapore on Sunday.

The head of Indonesia¡¯s search and rescue agency earlier on Monday said the missing jet could be at the bottom of the sea after it was presumed to have crashed off the Indonesian coast.