The incident happened sometime between 7 p.m. and 8 p.m.
A spokesperson for Morey's Piers, which owns Surfside Pier, said the evacuation happened as a precaution at the request of police.
Police say a man pulled out a gun and he was later taken into custody.
No one was hurt and the pier has since reopened.
(Correction: An earlier report said that two piers were evacuated).
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