Nine people, including the shooter, were killed on Wednesday in a shooting in downtown San Jose, California, Santa Clara County Sheriff’s Office spokesman Russell Davis said at a press conference.
Davis also explained that several people were injured, some of them in serious condition, and that police had found explosives at the scene.
The incident occurred at the Santa Clara Valley Transportation Authority’s (VTA) switching yard in downtown San Jose, where it stores and maintains rail cars.
The alleged perpetrator was a VTA worker, as are several of the victims, the police spokesman said.
Police received the first call about the shooting at 06.34 on Wednesday, local time (13.34 GMT).
At the same time, San Jose police are investigating a fire that broke out at the same time in a residential area of the city, which according to local media would be the home of the perpetrator of the shooting.
No one was in the house, but large quantities of ammunition cartridges and gasoline cans were found.
With a population of just over one million, San Jose is the third largest city in California, and is located south of the San Francisco Bay Area, in the heart of the technology-heavy area known as Silicon Valley.
VTA announced that its light rail service, which connects San Jose with neighboring cities, will stop operating from noon and for the rest of the day in tribute to the victims.