SOFIA, Aug. 25 (Xinhua) -- Two policemen were killed Thursday while trying to stop a bus transporting illegal migrants in Bulgaria.

According to the Interior Ministry, the accident took place around 5 a.m. local time (0200 GMT) in Burgas, a port city in Bulgaria.

The bus hit a police car, which was trying to stop it, and the two policemen inside the car died on the spot, the ministry said.

No bus passengers were injured, it said.

According to Bulgarian National Television, the bus was transporting 47 or 48 migrants. Their nationality is yet to be confirmed.

The cause of the accident has yet to be determined.  Enditem