Manchester United are on a collision course with the Premier League after defending their handling of the violent fan protest at Old Trafford.Sunday's high-profile fixture with Liverpool had to be postponed after the demonstration involving thousands of supporters against American owners the Glazers spiralled out of control.Fans clashed with police outside the ground while hundreds more smashed through barriers and gates to get onto the pitch to swing on the crossbars, pinch corner flags, throw flares, damage TV cameras and infiltrate corridors.The Premier League has launched an investigation into how the carnage was allowed to happen - and demanded answers from United and Greater Manchester Police (GMP).United are under pressure to explain.
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