By Jacob Leeks The FA have strongly condemned the tragedy chanting that marred Manchester United’s win over Liverpool after a person was arrested. United claimed a dramatic 4-3 win over their bitter rivals on Sunday to reach the semi-finals of the FA Cup. Amad scored a last-gasp goal to send his side through and end Liverpool’s hopes of winning a quadruple of trophies in Jurgen Klopp’s final season. But their famous win was marred by incidents of tragedy chanting, with United fans heard singing ‘always the victims, it’s never your fault’, ‘The Sun was right – you’re murderers’ and ‘murderers’ …