TEEN pop idol Justin Bieber is under investigation for assaulting a worker with a toy gun at a venue where he was performing, it was reported yesterday.

The alleged incident was said to have happened in Ottawa.

Reports say a woman at the venue complained of being hit by a foam dart fired by 18-year-old Canadian Bieber, or someone close to him.

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Earlier this month a $9 million lawsuit against Bieber, by a woman who said he was responsible for her ear-drum bursting at one of his concerts in the United States, was dropped.