Vallejo police arrested one man after a nearly four-hour standoff Wednesday in which two reported hostages escaped harm.
The suspect, who has yet to be named, reportedly fired multiple rounds from a handgun around 3 p.m. before barricading himself and two women inside a house in the 500 block of Monterey Street, police Lt. Jim O'Connell said.
"I'd say they were all familiar," O'Connell said of the relationship between the suspect and the two reported hostages.
One woman managed to escape on her own, leaving the suspect with the other, O'Connell said.
Vallejo police called in a K-9 unit and its Emergency Services Unit, which comprises hostage negotiators and SWAT officers. Some Benicia police units were also called in to assist, O'Connell said.
A California Highway Patrol helicopter hovered over the scene.
Police cordoned off the area surrounding the barricaded home, including parts of Virginia Street and an alley off Alameda Street that led directly to the house on Monterey Street. Neighbors and on-lookers milled around just beyond the yellow police line, attempting to see the events unfold.
Throughout the afternoon, police hostage negotiators tried to coax the suspect into surrendering peacefully.
About 6:40 p.m., police units entered the home, freeing the remaining woman and arresting the suspect.
No one was hurt, O'Connell said.
The investigation was continuing late Wednesday, and no handgun has yet been recovered, he added.
While it is still unclear why the suspect began firing his weapon, "there is some indication of drug use," O'Connell said.
MediaNews staff writer Jessica A. York contributed to this story.