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Cops: Gun got into Detroit building when guard stepped away

In this photo provided by the Detroit Police Department, an x-rayed photo shows what appears to be a revolver, in blue at right, among other contents of a briefcase that passed through security at the Coleman A. Young Municipal Center in Detroit on Monday, June 20, 2016. Police locked down the adjacent buildings and evacuated workers and visitors. The two buildings are connected by a lobby and house some Wayne County courtrooms and city of Detroit offices, including the mayor’s office and City Council. (Detroit Police Department via AP)

In this photo provided by the Detroit Police Department, an x-rayed photo shows what appears to be a revolver, in blue at right, among other contents of a briefcase that passed through security at the Coleman A. Young Municipal Center in Detroit on Monday, June 20, 2016. Police locked down the adjacent buildings and evacuated workers and visitors. The two buildings are connected by a lobby and house some Wayne County courtrooms and city of Detroit offices, including the mayor’s office and City Council. (Detroit Police Department via AP)  (The Associated Press)

Detroit's police chief says a security guard briefly left a checkpoint when a bag containing a gun passed through an X-ray machine, causing a lockdown and evacuation at a government building.

The owner of the bag picked it up and continued walking into the Coleman A. Young Municipal Center on Monday morning before the image of a gun was spotted on a screen.

Police Chief James Craig said Tuesday that the guard shouldn't have left the checkpoint.

The two-tower center is home to Detroit city hall and Wayne County civil courts. It reopened Tuesday.

A man whom police described as "a person of interest" was interviewed, but Craig says he didn't acknowledge having a gun and won't be charged.

Craig says eight guns have been confiscated at the checkpoints in recent months.