PGA of America chief executive Derek Sprague says the abuse Rory McIlroy and his family suffered at the Ryder Cup "crossed the line" and he plans on apologising to them.

The Northern Irishman was heckled throughout the three days at Bethpage Black by a raucous crowd, suffering crude personal taunts and repeated attempts to distract him as he prepared to play shots.

The world No 2 revealed his wife Erica was also caught in the commotion as a beer tossed from the crowd hit her hat when the atmosphere was at its most frenzied during Saturday's fractious fourballs session.

McIlroy himself lost his cool at times during the week, making an offensive gesture on one occasion and shouting back on another, while play was repeatedly held up as police tried to restore calm.

"It's unfortunate that

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