(CNN) - The missing AirAsia jet probably crashed into the sea, Indonesia's top rescue official said Monday, citing radar data from the plane's last contact.
"Our early conjecture is that the plane is in the bottom of the sea," Bambang Sulistyo, head of Indonesia's national search and rescue agency, told reporters, saying the view was based on the plane's flight track and last known coordinates.
But searchers still don't know exactly where the aircraft is, he said, and may need help from other countries for an underwater search.
The search for AirAsia Flight QZ8501 resumed on Monday, a day after the commercial jet disappeared in Indonesian airspace with 162 people aboard.
Ships, planes and helicopters are looking for the missing aircraft, according to Indonesian authorities, who are leading the search and rescue operations.