A 37-year-old Washington man was arrested last night after police fired tear gas into the Southeast house where he had barricaded himself after allegedly shooting and slashing the elderly woman he had been living with there.

Police said Maggie Batson, 83, suffered minor wounds to the neck when she was shot with a pistol and slashed with a knife about 6 p.m. while sitting in the upstairs bedroom of her home at 3905 Burns Place. Police were called after Batson ran to the home of a neighbor who summoned help.

Members of the police Special Operations Division tried to persuade the man to surrender during two hours of subsequent negotiations, but when that failed, they fired several cannisters of tear gas into the home, driving the man out.

The suspect was charged with assault with a dangerous weapon. He was being treated last night at D.C. General Hospital for what police described as self-inflicted knife wound. Police said he had once been treated at St. Elizabeths Hospital.

Authorities said they could give no motive for the attack. Neighbors said they believed the suspect may have been a distant relative of Batson, but this could not be confirmed.

Batson was reported to be in "fine" condition at D.C. General early today.