Long Beach police say the incident is now over but didn't elaborate. They received reports of a shooter around 2:25 pm (local time) today.
Police say there are multiple victims at the scene but nothing about the number or their conditions.
Video showed people running from an unmarked building shouting about a shooting inside.
The two-story building is home to several law offices, but police did not specify what kind of business it is.
Dozens of police officers, including members of a SWAT team, surrounded the building.
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