LOS ANGELES -- Violence erupted at three area theaters on opening night of the new Eddie Murphy movie "Raw," leaving one man shot to death and another with knife wounds.

A 21-year-old man was fatally shot in the chest about 9:30 p.m. Friday by an unidentified man near the snack bar at the Rosecrans Drive-In in Paramount, an unincorporated area of Los Angeles County, Deputy Dan Cox said.

At about the same time another man was stabbed in a Monrovia movie theater showing "Raw," Murphy's new comedy concert movie. Less than three hours later, police had to break up a rowdy crowd of 1,500, some of whom fought in the streets of Westwood Village near a theater showing the movie, police said.

Law enforcement officials had no explanation for the outbreaks of violence at the "Raw" showings.

"Who knows why it's happening?" Cox said. "There's really no known reason for what's happened."

The Rosecrans drive-in shooting victim, whose name was withheld, was shot in the chest during an argument with another man. He died at a nearby hospital an hour later. The suspect fled.

Minutes later, a man was stabbed in the chest and three people were arrested during a gang fight involving about 60 people at a screening of "Raw" at the Mann Theater in Monrovia, police Lt. Patrick Hardy said.

Theater officials called police at about 10 p.m. and the scuffle moved to the theater lobby, then to the parking lot, Hardy said. Police charged two juveniles with fighting and failure to disperse, he said.

More than two dozen police officers were sent to Westwood Village shortly after midnight to quell a disturbance created by about 1,500 people gathered near the Mann Village theater, where "Raw" also was showing, Sgt. Sean Kane said.

There were no reports of injuries or property damage but police arrested five people, including three USC football players.

"They were a disturbing-the-peace kind of crowd so we closed it down and sent them home," Kane said. "They were milling about on the street and interfering with traffic. There were fights out on the street."

By 1 a.m. police officers from West Los Angeles and other parts of the city had gained control over the unruly crowd in the popular shopping, restaurant and theater district bordering the UCLA campus.

"I really don't know what touched it off," Kane said. "It was just like the Westwood Village normal summertime activity. However, it's not summer."

Kane said officials at the Mann Theater canceled the 12:45 a.m. late show after the disturbance.