The Fourth of July concert on Philadelphia’s Benjamin Franklin Parkway has been paused amid a severe thunderstorm warning in the city. 

The One Philly: Unity Concert for America started at 5 p.m. as historically high temperatures gripped in the region. 

Attendees are being asked to seek shelter.

A sign at the Parkway concert asks attendees to evacuate the area because of impending storms

CBS News Philadelphia

Christina Aguilera, The Roots, Will Smith and others are expected to perform. 

A severe thunderstorm warning is in effect in Philadelphia and some surrounding areas until 10:30 p.m.

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CBS News Philadelphia

This is a developing story and will be updated.