Harlequins director of rugby Conor O'Shea has blasted the match officials following his side's 31-26 win at London Welsh in the Aviva Premiership on Sunday.
Quins returned to the top of the table thanks to the bonus-point victory, but O'Shea was far from happy with the performance of the referee and his colleagues.
"I'm unbelievably frustrated, you'd have to go a long way to see worse," he told Sky Sports News.
"Everything was wrong - it was incredible. The offside line was irrelevant, trailing runners coming back was irrelevant, backing into the maul, not releasing in the tackle - all irrelevant.
"We have a feedback process for the referees but it's not actioned upon and it's very difficult at times."
Harlequins resume their Heineken Cup duties on Saturday when they host Connacht.
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