MINNEAPOLIS (AP) -- Minneapolis police say 154 people didn't learn that they bought counterfeit Super Bowl tickets until they arrived at U.S. Bank Stadium Feb. 4.

Minneapolis police Lt. Kim Lund says that the number of fake tickets this year was seven times more than discovered at Houston's game last year. People spent between $400 and $5,000 on the bogus tickets.

Officers arrested 19 people in connection with the fake tickets over Super Bowl weekend. Bloomington police have also arrested another four or five people in possession of counterfeit tickets.

Shawn Neudauer is a Department of Homeland Security public affairs officer. He says authentic Super Bowl tickets have security features that are difficult to duplicate, such as heat-sensitive ink on the back.

Neudauer says investigations are underway.

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