O'Sullivan warned for improper gesture

Ronnie O'Sullivan is warned by referee Michaela Tabb for what she believes was an improper gesture during his World Championship semi-final against Judd Trump.

The Rocket finished the session 14-10 up in the best-of-33 contest.

O'Sullivan is no stranger to controversy and created headlines at the year's championship after saying he only returned to snooker because he needed the money.

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