A shocking map shows the last moments of a Boeing 737-500 before it vanished after reportedly falling 10,000ft in just sixty seconds.
The Sriwijaya Air passenger jet is believed to have plunged into the sea with more than 60 people on board, including 10 children.
Air traffic website Flightradar24 reports the plane descended by over 10,000ft in around a minute.
The site's map of the plane's route shows it flying over the sea, before taking a sharp turn and disappearing.
The aircraft appears to have plummeted into the water just four minutes after its departure from Soekarno-Hatta International Airport in Jakarta, Indonesia.
The Boeing 737-500 'classic' lost signal just after 7.30am (GMT) as it was heading to Pontianak, in West Kalimantan province, according to Flightradar24.
The Indonesian navy has said it has worked out the last known coordinates of the missing jet, and ships are being sent to the area.
All on board the plane were Indonesian, Indonesia's transport safety committee said.
Navy official Abdul Rasyid told reporters: "The coordinates have been found and have been given to all Navy vessels in the area."
Photos show rescue workers pulling debris from the water in a desperate search for survivors.
An Indonesian rescue agency confirmed suspected debris of the flight had been found.
No radio beacon signal had been detected, the agency said.
Residents of Thousand Island said they heard two explosions before finding items in the sea.
Surachman, a local government official, told Kompas TV that fishermen found what appeared to be the wreckage of an aircraft in waters north of Jakarta and a search was underway.
Other channels showed pictures of suspected wreckage.
"We found some cables, a piece of jeans, and pieces of metal on the water," Zulkifli, a security official, told CNNIndonesia.com.
The Indonesian Navy has deployed 11 ships to search for the wreckage underwater.
The plane is not a 737 Max, the Boeing model involved in two major crashes in recent years.
