New details emerged in the slaying of Hollywood publicist Ronni Chasen, but police detectives still have no motive or suspects in the Tuesday morning shooting attack.

Detectives now believe Chasen was killed in a car-to-car shooting, with the assailant firing into the passenger-side window of her Mercedes coupe. Beverly Hills Mayor Jimmy Delshad told The Times that detectives believe a vehicle taller than Chasen's car, perhaps a sport utility vehicle, was involved.

"Indications are [the shots] could have come from another car, higher up, maybe an SUV," said Delshad, adding that it does not appear at this point that the assailant fired while standing in the street.

Delshad and other Beverly Hills officials expressed shock over the shooting, saying the city has not seen anything like it in years.

Councilman John Mirisch said residents are horrified by the ruthlessness of the crime. “We hope the police can bring whoever committed this awful crime to justice,” Mirisch said. “It’s clearly their top priority.”