Police in eastern Pennsylvania are trying to figure out who stabbed a 16-year-old to death during a fight that broke out after a person showed up wearing a clown mask.

Authorities said the incident happened Sunday night around 8:30 p.m. in Reading, located about 50 miles northwest of Philadelphia.

"We urge anyone who was there to contact the Reading police," Berks County District Attorney John T. Adams told the Reading Eagle. "Someone was wearing a clown mask and a fight broke out. Anyone who knows anything about this, please contact the Reading police.

Officials told the newspaper they responded to reports of a person lying on a front porch of a home, and that there was a large crowd in the street. The Reading Eagle identified the victim as Christian Torres, 16, who was a 10th-grader at Reading High School.

Reading Police Chief Andres Dominguez Jr. told the newspaper that investigators believe there are several suspects.

“I believe the issues got out of control,” Dominguez told the Reading Eagle. “Everyone in the neighborhood knows each other."

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