School security and city police officers arrested a 15-year-old boy yesterday after an attack on a younger student at the Robert Poole Junior High School in Hampden, the scene of sporadic violence in recent years.
Police and school officials said they were ready for trouble after hearing reports the day before that a riot was brewing at the school in the 1300 block of West 36th Street.
About 8:30 a.m., a group of about eight teen-agers -- characterized as outsiders and suspended students -- walked onto the school campus and began harassing students as they entered the building, police and school officials said.
When a school security officer went to disperse the group, one of the youths threw several rocks and one hit the officer, police said.
The officer was unhurt and the teen-agers left without further incident, but moments later they confronted two black students as they were getting off a school bus at Falls Road and 36th Street, said Dennis S. Hill, a police spokesman.
Mr. Hill said the group of white teen-agers taunted the two and told them that the "skinheads" were after them. School officials emphasized there was no evidence the militant racial group call the "skinheads" was involved.
A 12-year-old black youth was then punched in the mouth and kicked as he fell to the ground, thespokesman said.
School officials said he was not hurt badly and continued on to school.
A 15-year-old was then taken into custody and charged as a juvenile with assaulting the security officer at the school and the younger boy. He was later released into the custody of his parents.
Brigitte W. Johnson, a school spokeswoman, said the situation inside the school "remained calm" during the two brief confrontations.
She said there have been no other incidents at Poole since the school year began three weeks ago.
Four years ago, nine students were sent to hospitals with injuries received during a racially motivated melee instigated by a half-dozen white teen-agers wielding baseball bats, boards and pipes.