According to preliminary information, just after 10 p.m. PT (1 a.m. ET) the Fullerton Police Department was in Hollywood conducting a sexual assault investigation, spokesperson Cpl. Billy Phu told CNN. When they tried to contact the suspect in the Hollywood area, detectives asked for the assistance of LAPD, he said.
At some point, the suspect barricaded himself inside a building at Paramount Studios, the spokesman told CNN.
It is not clear if the suspect is armed.
Aerial video shot by CNN affiliate KCBS shows police officers near a building on the Paramount Studios lot and police cars at the entrance to the studios. In video CNN affiliate KABC shot at the scene, part of a street is blocked off with yellow police tape, with a large presence of police cars and officers.
The Fullerton Police Department did not provide additional information on the suspect or the investigation and directed further inquiries to LAPD. CNN has reached out to the department.
This is a developing story.