PHILADELPHIA (AP) — Authorities have announced new charges against four juveniles arrested following an exchange of gunfire earlier this month between rival groups that wounded three people and sent participants in a joyful celebration of the end of Ramadan in west Philadelphia running for cover.

Prosecutors said Friday that the 15- and 16-year-old youths arrested after the April 10 gunfire at Clara Muhammad Square will be charged as adults and will face aggravated assault, conspiracy, simple assault and reckless endangering charges in addition to the firearms counts they faced earlier. A 21-year-old man was also charged with weapons counts.

Prosecutors said the weapons recovered from the five only match 13 of the 33 expired cartridge casings collected at the scene, and they urged any other people involved in the shootings to turn themselves in before authorities come to arrest them.