TROY, Ohio (AP) _ Residents heeded the mayor's pleas for calm and stayed home after three nights of demonstrations over the police shooting death of a teen-ager.

A police dispatcher said there were few people Tuesday night on Public Square, the site of protests that began Saturday over the June 9 shooting of Kerry Helton, 18.

''We are going to have to do a lot of soul searching, there's no doubt about it,'' Mayor Douglas A. Campbell said Tuesday.

His appeal for calm said many answers to questions about Helton's death will not be available until an internal police inquiry and a grand jury investigation, scheduled for July 15, are finished.

''These are really tough times for us. We are not used to this,'' said Arthur D. Haddad, service and safety director of the city of about 18,000 people 20 miles north of Dayton..

Two dozen people were arrested Monday night during a rock- and bottle- throwin g fracas involving about 100 people.

That followed a City Council meeting at which about 40 people demanded to know why Helton was shot 11 times by officers James Fox and Steven Cruea. They had been called to his mother's home to investigate a fight.

Police said the officers fired 12 shots at Helton when he threatened them with a 4-inch knife in the bedroom.

Helton was scheduled to appear in juvenile court the day after the shooting on charges he assaulted an officer May 24.

Miami County Coroner Dr. Walter Meeker released findings Tuesday that showed Helton had a blood alcohol content of 0.18 the night he died. A level of 0.10 is considered legally intoxicated under Ohio law. No drugs were found in Helton's blood, Meeker said.

Most of the arrests Monday were for disorderly conduct, Sheriff Luther Dunfee said, although two adults and a juvenile were charged with misdemeanor rioting and at least four others were charged with parole violations.

On Saturday night, about 100 people, most of them young, attended a peaceful candlelight vigil.

About 250 demonstrators, some carrying placards reading ''Killer Cops'' and others demanding the ouster of Fox and Cruea, showed up Sunday. Several were cited for honking horns unnecessarily and blocking traffic, Frank said.

''I think the whole town is really upset,'' said Kathy Jackson, who works at a small grocery store a few doors from the square. ''People every day say, 'Why didn't they use their billy clubs or shoot him in the leg or something?' ''

Restaurant owner Steve Hurney, for whom Helton worked as a cook for more than a year, described the youth as tough but well-liked and the best worker he's had.

Fox and Cruea are on leave with pay during the internal police investigation, although Frank said he thought they acted properly.

Miami County Prosecutor Jeffrey Welbaum, who will present the case to a grand jury, has asked prosecutors from neighboring Darke and Shelby counties to review the case to ensure fairness.