A plane belonging to the Iranian police force crashed in a mountainous area, killing three senior officials, Reuters reported. In all seven people died in the Saturday night accident, Breaking News Wire said.

The aircraft went down about 8 p.m., local time, in a province that borders Pakistan and Afghanistan. Aboard the flight were a pilot, co-pilot, a flight attendant and four passengers.

Everyone on the plane perished when the twin-engined turbo-prop Commander aircraft went down in the mountains outside Sistan-Baluchistan's capital of Zahedan, the state-run Islamic Republic News Agency (IRNA) reported. 

The wreckage was discovered hours later in a mountainous area known as Sabzpoushan, which is close to Zahedan, BNW said.

IRNA reported three senior police officials were among those killed, including Gen. Mahmoud Sadeqi. A colonel was also aboard the flight, but his name has not yet been released.

The police were traveling from Tehran to investigate the killing of four Iranian police officers in Sistan and Baluchestan province. 

The accident has not been deemed a terrorist attack, but further details about the fatal crash have not been released. However, it might have been caused due to technical problems combined with darkness and the pilot not being familiar with the region, the semiofficial Fars News Agency said, citing a source.

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