A D.C. police officer "unintentially" shot and seriously wounded a 38-year-old man last night during a Southeast drug sweep in which the victim and six others were arrested and a large quantity of cocaine was seized, D.C. police said.

They said that Lawrence L. Robinson of 223 37th Place SE was struck at least once in the shoulder by a blast from officer Patricia A. Williams' 12-gauge shotgun about 5:10 p.m. inside 3267 Stanton Rd. SE.

Williams' shotgun "unintentially discharged, striking Robinson in the back of the left shoulder," said D.C. police spokesman Lt. William White III. He said it was not known under what circumstances the weapon fired.

Williams, a 12-year veteran of the force, is a member of the department's special operations team, which was helping intelligence division investigators in the serving of a D.C. Superior Court search warrant on the Stanton Road address, White said.

Robinson was reported in serious but stable condition at Southeast Community Hospital last night, officials there said.

Robinson was arrested and charged with possession of cocaine with intent to distribute, as were six others present at the time. Police said the others charged were Crystal A. Devaughn, 25, 1546 Alabama Ave. SE; Barbara M. Carroll, 31, and Wilson Young Jr., 28, both of the Stanton Road address; James R. McDonald, 39, 3516 B St. SE; and William D. Atkinson, 30, 41 Bridle Path Court, Waldorf, Md. Police also seized three handguns.