A plane carrying 18 people is feared to have crashed in western Indonesia, government officials say.
Rescue teams are heading to its last known location near the North Sumatran village of Bahorok.
Transport ministry spokesman Bambang Ervan said the CASA C-212 aircraft was on an hour-long flight between North Sumatra and Aceh provinces.
He said it lost contact with air traffic control after sending out an emergency signal.
Indonesia relies heavily on air transport and has a poor aviation record.
In May, 27 people died when an Indonesian passenger plane crashed into the sea off the eastern province of West Papua.