A Mirage fighter jet crashed in eastern Pakistan on Wednesday, but the pilot ejected safely, the Air Force said, DPA reported.

The aircraft was on a routine operational training mission when it went down near a lake on the outskirts of Kalar Kahar, a small town located 135 kilometres south of Pakistan's capital Islamabad.

"The pilot parachuted to safety and there was no damage on the ground," a Pakistan Air Force spokesman said.

A board of inquiry was investigating the cause of the accident.