Police blocked off the scene of a police-involved shooting Thursday night in the Landover, Md., area. The suspect died. (Prince George's County Police Department)

An armed man who was shot by a Prince George’s County officer Thursday night in the Landover area has died of his injuries, officials said.

The man, identified by police as 40-year-old Gregory Campfield Jr. of Landover, was shot during a joint operation by the police Narcotics Enforcement Division and Emergency Services Team in the 7800 block of Sheriff Road.

According to police, authorities learned about a man who was selling drugs and who often carried a handgun. About 9:15 p.m., officers found a man — later identified as Campfield — who matched the description and tried to approach him, police said.

The man ran after officers gave warnings to drop his gun and show his hands, authorities said. Two uniformed officers ran after him.

Police said one officer caught up with Campfield after a 25-yard chase, taking him to the ground, and yelled to other officers that the man was armed with a handgun. Another officer observed him holding the gun, and the officer struggling with Campfield fired his weapon, striking him.

Campfield was treated by police until an ambulance arrived, but died hours later at a hospital after surgery.

Police identified the officer who fired as Cpl. Jeffrey Benson of the Emergency Services Team. He joined the Prince George’s police in 2006. He was placed on administrative leave pending the investigation, which is standard practice.

The officer fired “what we believe to be no more than three rounds,” County Police Chief Hank Stawinski said.

Police said they recovered a gun and narcotics. Officials released a photo of a black handgun they said was found in the grass.

The Prince George’s County State’s Attorney’s Office is reviewing the case.

Clarence Williams contributed to this report.