The gunfire broke out around 12:35 a.m. at a community center in White Township, where a private event was being held, Pennsylvania State Police said in a news release.
Troopers arrived at the scene to find several people wounded, including a person who was pronounced dead at the scene, authorities said. Police did not identify the person who died.
Those wounded were taken to a local hospital and at least two of them are believed to be in serious condition, state police said, CNN reported.
“At this time, the incident is under active investigation and no suspects are in custody,” state police said.
Authorities did not provide a suspect description and it’s unclear what led up to the shooting.
The incident adds one more to the at least 538 mass shootings reported so far this year in the United States, according to the Gun Violence Archive. The Gun Violence Archive defines a mass shooting as a shooting that injured or killed four or more people, not including the shooter.