PHILADELPHIA (CBS) – What officers believed to be a suspicious device outside the US Courthouse in Center City Monday evening turned out to be a knapsack filled with recyclables, according to authorities.

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Philadelphia Police and a bomb squad were called out to the scene at 6th and Market where a package was reportedly discovered outside the building.

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The Philadelphia Fire Department and Emergency Medical Services were also requested at the scene.

After an investigation, authorities determined the ‘suspicious device’ to be a knapsack filled with empty plastic bottles and beer cans.

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