A helicopter carrying 12 people crashed in eastern Turkey, security sources said on Tuesday.

A Turkish police helicopter crashed in the province of Tunceli, but the cause of the crash was unknown, added the source.

The helicopter disappeared 10 minutes after taking off from the town of Pulumur, in Tunceli province, the regional governor’s office said.

It was carrying seven police officers, a judge, a soldier and three crew members.

“It is being assessed that the helicopter crashed due to adverse weather conditions,” the governor’s office said in a statement.

Several search and rescue teams were sent to the area where it vanished, it said.