SLIPPERY ROCK, Pa. (AP) _ A black student admitted scrawling an ethnic slur on his dormitory door and blaming it on drunken vandals, school officials said.

Lewis Williams III, 19, of Baltimore was dismissed from Slippery Rock University after admitting his guilt, said Anthony Caldarelli, coordinator of student standards.

He was charged with criminal mischief and ethnic intimidation and faces a court hearing on March 22, campus police said.

Williams, a resident assistant who helped other students adjust to college, reported that the words ''head nigger'' had been scrawled on his door with a black marker on Feb. 18.

He told reporters he believed that, because there were no classes that day, drunken partygoers had written the words. Williams also said he believed the slur was a reaction to February's Black History Month celebrations.

Down the hall, the word ''nigger'' was scrawled outside the room of two other black students, police said. Williams also admitted writing on that door, school spokesman Ross Feltz said Thursday.

School officials said they could not reveal why Williams wrote the slurs because of a federal law protecting student confidentiality.

A woman who answered the phone at Williams' home in Baltimore and said she was his mother said he would not discuss the incident until consulting with a lawyer.

A similar incident occurred in Georgia in 1990. State investigators concluded that a 19-year-old black student wrote an epithet-laced threat on the floor of her Emory University dorm room.