Police detain man with handgun at San Francisco's Metreon Theater

San Francisco police detained a man with a handgun at the Metreon Theater on Tuesday, Nov. 29, 2016. (KGO-TV)

San Francisco police are investigating a frightening incident at the Metreon Theater Tuesday night.

Witnesses say a man started yelling and acting erratically as movie previews were wrapping up, just before 8 p.m.

When the moviegoers confronted him, they said he pulled a gun on them.

People in the theater ran out but the man reportedly calmly stayed in his seat.

The SWAT team evacuated the entire Metreon as a precaution.

Officers detained the man and found a handgun on him.

Nobody was injured.
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