ATF: No suspicious device at federal courthouse in Center City Philadelphia

PHILADELPHIA (WPVI) -- The ATF now says there was no suspicious device at the federal courthouse in Philadelphia on Monday morning.

Chopper 6 was over the scene in Center City as police investigated the threat around 10 am.

Sources say an anonymous caller reported a bomb was going to detonate, leading officials to evacuate the building.

They also shut down Market Street between 6th and 7th streets.

The all-clear was given soon after.

The incident is still under investigation.