Building manager John Blatt called police after a workman alerted him to the danger.
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"There's 15 people working in there-- and 15 kids. Maybe 40 people in there, today."
Outside, the Berkeley Police Department responded in force. They closed Martin Luther King Blvd, took cover where they could, and then, with K-9 units, officers entered the building.
Police took two men into custody, arrested one of them on the spot, and say they did find a rifle inside.
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Berkeley Police have not provided information yet about a motive.
We had no reports of injuries,
The kids in that pre-school are fine.