One person has been killed and at least seven others have been shot during a graduation party in Philadelphia, authorities said.
TV station KYW-TV reported the shooting occurred on Sunday shortly before 10.30pm local time.
Authorities said four teenagers between the ages of 15 and 17 suffered gunshot wounds to their legs.
Four adults in their 20s also suffered gunshot wounds.
Police said the one fatality was an adult but authorities have not provided a motive for the shooting.
No arrests have been made.
The shooting is one of numerous homicides that occurred amid a rash of gunfire around the city that also wounded a number of other people throughout the weekend.