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

SAN FRANCISCO (KGO) -- 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.