6 dead, 25 wounded in Philadelphia, Chattanooga club shootings.

A bustling entertainment district turned into a scene of carnage when multiple shooters opened fire in the South Street area of Philadelphia, police said.

Officers patrolling the South Street area heard gunfire shortly before midnight and observed "several active shooters shooting into the crowd," Pace said.

Police said hundreds of people were in the South Street area just before gunfire broke out.

One officer was "within about 10 to 15 yards" of one of the shooters and fired at the suspect, Pace said. 

Two handguns were recovered at the scene, including one with an extended magazine, Pace said.

The violence in Philadelphia marked the sixth mass shooting in the US just this weekend, according to the non-profit organization Gun Violence Archive

"The surge in gun violence that we've seen across the nation -- and here in Philadelphia -- makes me not just heartbroken, but angry," Philadelphia Mayor Jim Kenney said Sunday.

"Once again, we see lives senselessly lost and those injured in yet another horrendous, brazen and despicable act of gun violence."

"Numerous" shell casings were recovered from the area lined with trendy shops, bars and restaurants.