CHICAGO (CBS)–Congressman Luis Gutierrez is closing his Logan Square office today so he can hire private security for his staff after a troubling incident.

A man wearing a blue shirt, whose image was captured on surveillance camera, entered Gutierrez’s office at 2 p.m. on Wednesday.

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He reportedly yelled, cursed and threatened campaign workers.

The unidentified man also threw items around the office before leaving, but then came back for a second round of ranting.

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The man said he was a precinct captain for Alderman Ariel Reboyras.

CBS 2 reached out to Reboyras but he had not responded. Rep. Gutierrez’s daughter, Jessica, is running against Reboyras for his 30th Ward seat.

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Gutierrez is asking anyone who knows the man to call his office or police.