By Campbell Robertson Pooja Salhotra

Copyright

As federal and state law enforcement agencies arrived in York County to help with the investigation and the aftermath, the state police took over 911 calls for the Northern York County Regional Police Department, an agency with 68 officers covering a dozen jurisdictions across roughly 215 square miles.

Colonel Paris said the investigation was still active and would be led by the state police, along with the York County district attorney’s office. He added that warrants were currently being served as part of the investigation.

In a post on social media, Ms. Bondi said agents from the F.B.I. and the Bureau of Alcohol, Tobacco, Firearms and Explosives were on the scene to support local law enforcement.

Dave W. Sunday, the state attorney general, had been the district attorney in York County for seven years until he took office in January. In a statement, he said that “having served alongside these officers, I know of their caliber, their professionalism and the lasting impact they had on our community.”

Earlier in the day, Mr. Shapiro was at an event in Chester, Pa., marking the progress in reducing gun homicides. On Tuesday, he gave a speech in Pittsburgh on political violence, which drew national attention. In York, on Wednesday afternoon, he was talking about killings once again.

“We need to do better as a society,” he said. “We need to help the people who think that picking up a gun, picking up a weapon is the answer to resolving disputes.”

Reporting was contributed by David DeKok in North Codorus Township, Pa., and Rylee Kirk and Alexandra E. Petri in New York.