A Prince George's County police officer shot and wounded a man who had threatened him with a butcher knife early yesterday, authorities said.

Russell L. Jenkins, 25, of Capitol Heights, was reported in fair condition at the Prince George's County Hospital Center yesterday with a gunshot wound in the stomach and cuts on the wrist.

The officer who shot him, Patrick Cavanagh, 27, has served on the police force for 2 1/2 years. He was placed on administrative leave until the investigation is completed, a routine procedure, officials said.

It was the third time in a month that county officers have fired on allegedly hostile suspects, killing two of them.

Authorities said police were called late Wednesday to an apartment on Benning Road in Capitol Heights, where they were met by a woman who said a man had assaulted her and was trying to kill himself. Police did not identify the woman.

An ambulance crew found a man a short time later at Boone Hill and Benning Road and said that he threatened them with a knife, then ran away.

About 12:40 a.m., police said, officers returned to the Benning Road apartment after receiving another call from the woman, who told them the man had jumped out of a second-floor window.

Cavanagh and other officers subsequently found Jenkins in a nearby apartment, where Jenkins waved a 13-inch butcher knife at them, police said. A witness told police that Jenkins threatened the officers, telling them they would have to kill him or be killed.

Cavanagh fired his revolver, and a bullet hit Jenkins in the stomach, police said. No charges have been filed.