Manchester United will beef up security at Old Trafford - amid growing fears of a second fan protest when bitter rivals Liverpool return to face them in the Premier League.United have started a review of their safety measures in the wake of Sunday's shameful scenes that forced the game with Jurgen Klopp's men to be called off.Club bosses have vowed to ban those raging supporters who ran riot outside the stadium as the protest against American owners the Glazers turned violent.Video footage is being studied, while the Premier League have demanded answers from United, Greater Manchester Police and match organisers as to how the fiasco was allowed to happen.In the meantime, United are worried a repeat attack will take place when the most.
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