Arsenal beat Manchester United 2-1 in the FA Cup quarter-final-final on March 9 . Danny Welbeck scored the winning goal for Arsenal against United . Teenager has been cautioned after posting racist tweet aimed at Welbeck .
Arsenal beat Manchester United 2-1 in the FA Cup quarter-final on March 9 . Danny Welbeck scored the winning goal for Arsenal against United . Teenager has been cautioned after posting racist tweet aimed at Welbeck .