A gunshot-like noise put the Nicollet Mall area on high alert Friday, causing police to search an office building leased by Target, the Star Tribune reported.
Police were notified of the noise at about 11 a.m. Friday, the Star Tribune reported. The 911 call said shots were heard in the Retek building on Nicollet Mall. About 1,300 Target employees work in the building.
According to the Star Tribune, workers were warned of an "active shooter alert" and advised to stay in their offices. The University of St. Thomas Minneapolis campus, which is located nearby, warned its students of the incident as well, according to the Minneapolis St. Paul Business Journal.
A SWAT team searched the Retek building but found no evidence of a shooting. Police issued an all clear at about 1:30 p.m, the Business Journal reported.
Police later found that construction workers in the building used a tool that sounded like gunfire, the Star Tribune reported.