Police received a call that shots had been fired at Target Corporation's headquarters in downtown Minneapolis on Friday, the Star Tribune reported.
Police did not find any evidence of shots being fired after sweeping the building, the Pioneer Press reported.
A SWAT team and about a dozen squad cars were dispatched to 10th Street South and Nicollet Avenue after the call was received at around 11:30 a.m., the Pioneer Press reported. Police gave sounded the all-clear at about 1:30 p.m.
Some workers at the headquarters barricaded themselves into their offices once reports of the reported shots were received, the Star Tribune reported.
"We're all in a conference room. They had an announcement that there was a situation and we should go into a locked office," said Julia Brosz, a Target store planner who works in the downtown Retek Building.
Minneapolis Police Chief Janeé Harteau said workers may have mistaken noises in the duct work for shots, the Star Tribune reported.