A Boeing 737 aircraft has reportedly crashed moments after take-off from Jakarta in Indonesia and it's not yet clear if there are survivors.
Data from flight tracking website FlightRadar24 showed the aircraft climbing to an altitude of around 10,000 feet, before rapidly descending to just over 200 feet, and then disappearing off radar.
Sriwijaya Air flight SJ182 was just four minutes into its flight from Jakarta to Pontianak when the incident happened.
Rescue agency Basarnas said in a statement it would send a team to the Thousand Islands area to help in the search for victims "after the crash of Sriwijaya Air SJ 182".
All those on board were Indonesian, the country's transport safety committee said.
Indonesia's Navy had pinpointed the site of the missing aircraft and ships had been sent there, an official said. Authorities did not say whether they believed there were survivors.
The aircraft involved was a Boeing 737-500, and was more than twenty years old. There is no link to the recent issues with the more modern Boeing 737 MAX aircraft.
A Boeing spokeswoman said, "We are aware of media reports from Jakarta, and are closely monitoring the situation.
"We are working to gather more information."
A transport ministry spokeswoman said air traffic control at Soekarno-Hatta International Airport had asked the pilot why the plane was heading northwest instead of on its expected flight path just seconds before it disappeared.
There were no immediate clues on what may have caused the sudden descent and safety experts stress most air accidents are caused by a cocktail of factors that can take months to establish.
Unverified photos are being shared on social media of what appears to be wreckage being pulled from the water, however no comment has been made as to the authenticity of the posts.
Sixty-two people were on board the aircraft, which can carry up to 120 people.
The Sriwijaya Air fleet consists of 19 aircraft in total, made up of 737-500s and 737-800s.
