Four men have been arrested in the fatal shooting of an off-duty Prince George's County police officer who was trying to stop a robbery of a Hillcrest Heights jewelry store, according to law enforcement sources.

Prince George's police officials would not confirm or deny the arrests yesterday. They announced a press conference for today.

Law enforcement sources in both Prince George's and the District of Columbia identified one of those charged as Terrance A. Harris of Washington. He and three others are charged in the shooting of Officer Raymond Hubbard, 28, on Feb. 8. Hubbard, a two-year veteran of the force, was strolling through the Iverson Mall just after 6 p.m. when he learned of a robbery in progress at Kay Jewelers.

The officer was shot several times after he drew his gun and ordered the robbers to stop, according to bystanders and police.

At least two other persons were injured in the incident, after which Hubbard's assailants commandeered two cars and fled.

Police said previously that Harris, bleeding from a gunshot wound to the back, was delivered to the emergency room of Howard University Hospital on the evening of Feb. 8 and first told doctors he had been wounded in a fight. Later, police said he claimed to have been wounded by a stray bullet at the shopping mall.

Harris was transferred from the hospital to the D.C. Jail infirmary yesterday and charged with being a fugitive in the slaying, according to the sources.

Sources in Prince George's said the other three suspects are in custody of the county police.