The plane caught fire on landing at Tehran's Mehrabad airport. (Representational)

An airliner caught fire on landing at Tehran's Mehrabad airport on Tuesday but all 100 passengers were evacuated without injury, the head of Iran's emergency department said on state television.

Pir-Hossein Kolivand said the fire broke out after the aircraft's landing gear did not open properly, and was later brought under control.

The airplane was a Fokker 100 belonging to Iran Air, the Fars news agency reported.

The pilot was not able to open the back wheels of the plane and circled the airport attempting to open all the wheels before landing the plane on its body, according to Fars.