A small Iranian passenger plane crashed while taking off from an airport near the capital, Tehran, state media reported.
The country's state-run media said at least 40 people were feared killed in the crash.
The aircraft, an Iran-140 jet typically used for short domestic flights, crashed near Mehrabad airport, west of Tehran, Iran's state-run IRNA news agency reported. The plane went down in a residential area after its engine went out, the agency reported.
"Initial reports indicate that the 48 people aboard the plane have been killed, including seven children," IRNA reported. It did not identify a source for its claim. State television said 42 people were aboard the plane when it crashed.
Iranian state television reported that the plane was an Iran-141 flown by Taban Air flight. IRNA said it was flown by Sepahan Air. The conflicting information could not be immediately reconciled.