A BRAWL involving 1000 teenagers at a shopping mall in Pennsylvania forced stores into lock-down on Friday.
It is reported the brawl which began on the ground level of the Monroeville Mall before moving upstairs, involved mainly girls.
Groups of girls are alleged to have brawled throughout the shopping centre with police from four different agencies being called in to stop the chaos.
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Word of the fight is believed to have spread on social media with people travelling more than 25km to join in.
Police are trawling social media in the hope to find the troublemakers who started the brawl.