Police in Camden County, New Jersey were called to the playground in the 300 block of Middlesex Street to break up a fight around midnight.
About 45 minutes later they were called back because an 18-year old man had been shot in the chest.
Neighbors say the playground is a popular place for teens to hang out... and often fight.
"On this street all the time, there's at least 10 to 15 fights a week at least," said Daniel Tamarchio, who lives near the playground.
The shooting victim was taken to a local hospital in critical condition.
No arrests have been made.