Two tour buses transporting rockers Foreigner and Styx's crew have gone up in flames in Philadelphia, Pennsylvania.

The two crew vehicles, which were not occupied at the time of the incident, caught fire on Wednesday afternoon (02Jul14) while parked in a car lot.

The cause of the fire is currently under investigation by local authorities, reports No injuries have been reported.

The two bands are set to hit the stage together in Camden, New Jersey on Thursday (03Jul14).