A passenger plane with more than 50 people on board has gone missing shortly after take-off from the Indonesian capital Jakarta.
The Sriwijaya Air Boeing 737 lost contact en route to Pontianak in West Kalimantan province, officials said.
Flight tracking website Flightradar24.com said the aircraft had lost more than 3,000m (10,000ft) in altitude in less than a minute.
Pictures of what seemed to be aircraft debris appeared on TV and social media.
A number of residents of an island near where the plane disappeared told the BBC Indonesian service they had found objects they thought were from the plane.
The transport ministry said search and rescue efforts were under way.
It said last contact with the plane, with the call sign SJY182, was made at 14:40 local time (07:40 GMT).
The exact number of passengers on board is not clear, though it has a capacity of 130.
The usual flight time to Pontianak, in the west of the island of Borneo, is an hour-and-a-half. According to registration details, the plane is a 26-year-old Boeing 737-500.
Sriwijaya Air, a local budget airline which flies to Indonesian and other South-East Asian destinations, said it was still gathering information about the flight.
The plane is not a 737 Max, the Boeing model involved in two major crashes in recent years.
The first of those, in October 2018, involved an Indonesian Lion Air flight which plunged into the sea about 12 minutes after take-off from Jakarta killing 189 people.
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