Iran's Revolutionary Guards Corps says the crash of a military plane in Tehran has killed 36 people, including 30 members of the corps.
State media quote the Revolutionary Guards as saying the Antonov 74 aircraft crashed on takeoff Monday from Mehrabad airport after one of its engines caught fire.
Six crewmen were among those killed. Two Revolutionary Guards who survived the crash are being treated in a hospital.
The Revolutionary Guards says it has begun an investigation into the cause of the crash.
Iran has a history of aircraft accidents. Three military planes have crashed in the past year, and a civilian airliner crashed in September. Airline safety experts say Iran's aging planes are poorly maintained.
The government has blamed a U.S. trade embargo, which makes it impossible for Tehran to buy parts for its old U.S.-built aircraft. The embargo has forced Iran to buy Soviet-designed aircraft, such as the Russian-built Antonov 74.
Some information for this report was provided by AFP, AP and Reuters.