UPDATE - 1:35 p.m.: Police have given the "all clear" signal, and employees who were outside are being let back into the building.
Word from spokespeople (Minneapolis Police and Target, both) stated the popping noise "may have come from ductwork" or construction.
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A Target employee from St. Michael, who works at Target headquarters in downtown Minneapolis, said her building is on lockdown because of reports of a possible shooter Friday afternoon.
She is on the scene and shared a photo with St. Michael Patch from a downtown building of the scene, where there are "cop cars everywhere."
The employee told St. Michael Patch they're expecting an "all clear" soon, and they're hoping the sound was something in the building that just "exploded" or "popped."
She said her building is completely locked down, she can't get in, and people are crowded in rooms. She was at another building for a meeting.
The Minneapolis-St. Paul Business Journal reports the possible shooting took place in a building formerly known as the Retek building, part of the Target headquarters complex at 50 S. and 10th Street.
Minneapolis Police Sgt. Steve McCarty confirmed that K-9 units were doing floor-by-floor inspections and as of now, have not found anything yet.
At a press conference, McCarty said, "At this particular time, there is no evidence that any shots have been fired, no victims, no suspects, no evidence of an actual shooting, and the search is continuing as we speak."