Six people were injured after a gunman-opened fire during halftime of a basketball game at a local recreation center in Southwest Philadelphia on Aug. 22.

“We don’t know why it happened, we don’t have a motive,” Det. Orlando Ortiz told Reuters.

According to The Philadelphia Inquirer two officers were among the 500 spectators at the game. After the shooting occurred, the officers chased the suspect, but were unable to apprehend him.

Lt. John Walker said five men and a woman suffered wounds. Four of the men and the woman were shot in the lower extremities and taken to Hospital of the University of Pennsylvania with non-life threatening injuries. The sixth victim was shot in the stomach and leg and was listed in critical condition.

“A male pulls out a weapon, begins shooting at a male, who is in the center of the court,” Walker said at a press conference. “There’s approximately 11 shots fired from that weapon.”

Police reportedly recovered a gun near the scene and are investigating to see if ballistics will match the weapon to the shootings.

The shooting took place at Kingsessing Recreation Center, which had offered extended hours to help keep people off of the streets and away from violence.