By Steve Beck

PHILADELPHIA (CBS) — Philadelphia police are investigating a serious crash that involved a SEPTA bus early Tuesday morning.

The accident happened at 19th Street and Cecil B Moore Avenue in North Philadelphia.

According to investigators, one of two vehicles involved in the crash was trying to pass a SEPTA bus when it lost control and flipped over and ended up on its roof. The second car sustained serious damage.

There was no immediate word on injuries. The accident remains under police investigation.