A U.S. Postal Service mail carrier was shot and killed Saturday night while on his rounds in Prince George’s County, authorities said.

The shooting occurred about 7:20 p.m. in the Cheverly-Landover area of the county, said Officer Harry Bond, a police spokesman.

Apparently the man was delivering mail on or near Reed Street when the shooting occurred.

One resident of the street said he was returning home just as the carrier had finished placing mail into the letter box at his house.

He said the postal worker was not the regular carrier, and when he called to him, he did not respond.

The man took his mail and went into his house. Within minutes, the man said, he heard two or three gunshots.

When he looked out, he said, he noted that a Postal Service truck was near the corner of the street. But no carrier was to be seen.

It was well after sunset when the shooting occurred. Residents of the area said mail is not usually delivered there so late.

“It was mighty late,” the neighbor said.

It was thought that the carrier’s unfamiliarity with the route might have been linked to the lateness of his deliveries.

Bond said the carrier died at the scene. He said no motive for the attack had been determined by late Saturday night.

He said detectives were still at the scene, which is in a neighborhood about a half-mile south of the Cheverly Metrorail station.

Shootings of mail carriers in uniform and on their rounds are extremely unusual.