Indonesian airline Lion Air says a domestic flight it lost contact with crashed, just moments after it took off from Jakarta.
The plane was carrying up to 189 passengers, according to Indonesia's National Search and Rescue Agency. Among those in the aircraft were a child and two babies.
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Footage shows some of the debris in the ocean in the aftermath of the crash.
Indonesia's search and rescue agency has visited the crash site, where they say they've discovered passengers' ID cards and clothes.
The flight took off from Soekarno-Hatta International Airport at 6:21am (local time) and crashed 13 minutes later. It was scheduled to land in Pangkal Pinan at 7:30am.
Flight JT610 from Jakarta to Pangal Pinang was being operated by a new Boeing 737 that was only two months old.
Data from flight tracking website FlightRadar24.com shows the aircraft climb to 5000 feet before disappearing off radar.
Indonesia's search and rescue agency said on Monday that a Lion Air passenger flight from Jakarta, the capital, to the city of Pangkal Pinang off the island of Sumatra, had crashed into the sea.
"It has been confirmed that it has crashed," Yusuf Latif, a spokesman for the agency, said by text message, when asked about the fate of the Lion Air plane.
The plane lost contact 13 minutes after take-off, according to the official.