Boeing 737 plane crashes in sea off Jakarta

A Lion Air Boeing 737 passenger plane with 188 people on board has crashed into the sea shortly after taking off from the Indonesian capital, Jakarta.

Flight JT 610 was on a scheduled flight to Pangkal Pinang, the main town in the Bangka Belitung Islands.

It lost contact with ground control a few minutes after take-off, and is believed to have ended up underwater. It is unclear if there are survivors.

The plane was a Boeing 737 MAX 8, a brand new type of aircraft.

"The plane crashed into water about 30m to 40m deep," Search and Rescue Agency spokesman Yusuf Latif told AFP news agency. "We're still searching for the remains of the plane."

Items believed to belong to passengers have been found in the water, including ID cards and driver's licences, the search and rescue agency said on Twitter.

At an earlier news conference, officials said the plane had been carrying 178 adults, one infant and two babies, as well as two pilots and five cabin crew. However, there are conflicting reports on the exact number of people on board.

Flight JT 610 took off from Jakarta at 6:20am local time on Monday morning

It was due to arrive at Depati Amir airport in Pangkal Pinang an hour later but 13 minutes into the flight, authorities lost contact with the plane.

The pilot had asked to return to Jakarta's Soekarno-Hatta airport, the head of Pangkal Pinang's search and rescue office, Danang Priandoko, told local news outlet Kompas.

The head of Indonesia's disaster agency, Sutopo Purwo Nugroho, has tweeted images which he said showed debris and personal belongings that came from the aircraft and had been found floating in the sea.

Debris was also seen near an offshore oil refinery operated by state-owned energy firm Pertamina, an official from the firm said.

He also shared a video he said had been taken from a tugboat off Karawang, just east of Jakarta, which appeared to show floating debris and an oil slick.

Lion Air said in a statement that the pilot and co-pilot were experienced, with more than 11,000 flight hours between them.

Three of those on board were trainee flight attendants and one was a technician.

A spokesperson for Indonesia's Finance Ministry Nufransa Wira Sakti said they worked at the finance ministry offices in Pangkal Pinang but had been in Jakarta for the weekend. They routinely took this flight.