Two police officers were shot near the conclusion of a Fourth of July fireworks show in Philadelphia.

One officer assigned to highway patrol received a graze wound to the forehead, police said. The round stopped in the hat of the 36-year-old, who has 14 years of service.

The other officer, who was assigned to the Montgomery County Bomb Squad, sustained a gunshot wound to the right shoulder. The 44-year old, who has 16 years of service, was present to work security at the event, as was the other injured officer.

They both were transferred to the Jefferson University Hospital for treatment, according to WPVI, and police said they have been released.

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The shooting took place in Center City on Monday night. The city Office of Emergency Management advised on Twitter to avoid the area. 

This marks at least the second incident of gun violence around an Independence Day celebration in the United States, after at least six were killed in a shooting at a parade in Highland Park, Illinois. 

A suspect in the Philadelphia shooting has not yet been named or arrested. 

Philadelphia Mayor Jim Kenney said at a late-night press conference that it had been "a laid-back, chill day" -- "but we live in America." 

"If I had the ability to take care of guns," he said, "I would."