A fire broke out at Tehran's domestic Mehrabad airport on Monday and reports said a training aircraft had crashed but there was no immediate information on any casualties, Iranian media said.

"Parts of Mehrabad airport caught fire with dense plumes of smoke in the sky around it," Fars News Agency said. In a separate report, it said a Russian-made training aircraft had crashed near the airport after experiencing technical problems. It said the two pilots parachuted to safety but did not make clear whether this was the cause of the fire.

Other news agencies carried similar reports.

Mehrabad airport, which handles domestic flights across the country, is located in the outskirts of the Iranian capital of 12 million people.