Philadelphia Sixers star Ben Simmons has reportedly left hundreds of children devastated after sneaking away from a basketball camp and refusing to sign autographs or take pictures with waiting fans.

The 23-year-old hosted two training sessions for hundreds of children aged between seven and 17 at Hills Basketball Stadium in Castle Hill, Sydney, on Sunday.

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But Ben, who recently signed a $243million, five-year deal with Philadelphia 76ers, left the stadium without greeting the hundreds of youngsters who had gathered outside before driving away in a Mercedes.

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