Rory McIlroy swore at raucous Ryder Cup fans on Saturday before extra security was deployed to monitor rowdy galleries during the Europe star's afternoon four-ball match alongside Shane Lowry as tensions reached fever pitch.

In his morning foursome match with Tommy Fleetwood, McIlroy -- who on Friday had flipped the middle finger to hecklers -- used an obscenity as he told noisy fans to "shut up" as he prepared to play a shot.

Later, McIlroy was forced to pack off a putt by a heckler on the fourth hole in his four-ball match with pal Lowry, a move that draw of chorus of boos and prompted McIlroy to ask a rules official if anything could be done about over-the-top annoyers.

As the abuse from spectators continued, extra security staff appeared to have been brought in to keep a watchful ey

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