YORK COUNTY, Pa. — In a tragic incident on Wednesday in southern Pennsylvania, three police officers were killed and two others injured, with the shooter subsequently being shot dead by police, authorities reported.

The officers were at the scene, amid rolling farmland, to follow up on a domestic-related investigation that began the previous day.

“This is a profoundly tragic and heartbreaking day,” Gov. Josh Shapiro stated during a news conference. “We mourn the loss of three valuable lives dedicated to serving this county, this state, and this nation.”

“This kind of violence is not OK. We need to do better as a society,” Shapiro said.

This incident ranks among the deadliest for Pennsylvania police forces in recent years. In a previous incident in 2009, three officers in Pittsburgh encountered a similar fate when they were ambushed and killed during a domestic dispute call by an assailant wearing a bulletproof vest.

Sympathies have been shared from various police departments in the region through social media, and flowers have been placed at the Northern York Regional Police Department headquarters in remembrance.

“The sorrow will be immense, yet we will endure it,” remarked Pennsylvania State Police Commissioner Christopher Paris, who promised a thorough and just investigation into the event.

Dozens of police and emergency vehicles with their lights flashing formed a procession to the coroner’s office. People lined the road holding American flags and saluted as it passed.

The shooting erupted in the area of North Codorus Township, about 115 miles (185 km) west of Philadelphia, not far from the Maryland line, authorities said.

Dirk Anderson, a farmer who lives across a two-lane country road from the scene, said he was in his shop “when we heard shots,” which he described as “quite a few.” He saw a helicopter arrive and a large police vehicle response.

The two injured officers were in critical but stable condition at York Hospital, authorities said.

Authorities did not identify the shooter, the officers or which police department they belonged to, or describe the circumstances of how they were shot, citing the ongoing investigation.

Shapiro said he and other officials met with the slain officers’ families, who, while grieving, took the time to say how proud they were of their loved ones.

Attorney General Pamela Bondi called the violence against police “a scourge on our society.” She said federal agents were on the scene to support local officers.

The emergency response unfolded on a rural road in south-central Pennsylvania. Officers were keeping people well back from the scene, with some 30 police vehicles blocking off roads bordered by a barn, a goat farm and soybean and corn fields.

Another officer in the area was killed in February, when a man armed with a pistol and zip ties entered a hospital’s intensive care unit and took staff members hostage before a shootout that left both the suspect and an officer dead.

“We need to do better as a society,” Shapiro said. “We need to help the people who think that picking up a gun, picking up a weapon is the answer to resolving disputes. We need do better when it comes to mental health.

“We need to do better when it comes to looking out for those who are in need so we don’t have to deal with tragedies like this,” he said.

Associated Press reporters Patrick Whittle in Portland, Maine; Kimberlee Kruesi in Providence, Rhode Island and Michael Casey in Boston, contributed to this report. Levy reported from Harrisburg, Pennsylvania and Dale from Philadelphia.

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