Police in Riot Gear Respond to Summer Jam Hip Hop Event in New Jersey

Videos on social media showed people being arrested, bottles being thrown and police helicopters over the MetLife Stadium stadium parking lot.

Police stand guard near the entrance of MetLife Stadium during Hot 97's Summer Jam on Sunday, June 7, in East Rutherford, New Jersey.Scott Roth / Invision via AP

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June 7, 2015, 10:08 PM EDT / Updated June 7, 2015, 10:09 PM EDT / Source: NBC New York

Videos on social media showed people being arrested, bottles being thrown and police helicopters over the MetLife Stadium stadium parking lot.

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