A Crofton man awaiting trial on charges of assaulting a police officer was indicted yesterday in Montgomery County on armed robbery charges stemming from holdups at convenience stores and gas stations.

Harold D. Rogers, 24, who was sentenced last month by a Montgomery County judge to 15 years in prison on burglary convictions, was indicted yesterday on two counts of robbery, six counts of armed robbery and one count of assault with intent to rob.

Meanwhile, Montgomery County prosecutors have decided not to file charges against two Anne Arundel County detectives accused of kidnapping and threatening Rogers's younger brother after Harold Rogers escaped from custody in August.

Rogers, who is in a Maryland state prison, allegedly assaulted and abducted Anne Arundel County police Officer Janice J. Schwartz on Aug. 28 as she was driving him to jail on a felony theft warrant.

The alleged assault occurred while Rogers was awaiting sentencing for violation of probation in Montgomery County on the burglary convictions.

Police said Rogers struck Schwartz in the face and banged her head against a car window before grabbing her revolver. He then forced the officer to drive him more than 15 miles before releasing her and stealing her car, police alleged. The car was later found abandoned.

Rogers remained a fugitive until Thanksgiving, when he was arrested by Prince George's County police at a Laurel motel. Police there have charged Rogers in connection with four armed robberies.

In Montgomery County, Rogers allegedly used a pistol to rob a convenience store in Wheaton and a gas station in Rockville in September, according to court documents. Police also are investigating Rogers in connection with a Nov. 10 robbery at a Rockville sporting goods store.