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British-born gunman 'convinced US authorities he was no threat'

British-born gunman Elliot Rodger, who stabbed and killed his US college room-mates before embarking on a shooting rampage, convinced authorities that he was not a threat during a welfare check to his home last month.

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US gunman 'investigated by police weeks ago'

A lawyer of film director Peter Rodger says the family called police several weeks ago after being alarmed by YouTube videos posted by his son "regarding suicide and the killing of people".

The attorney said police had conducted an investigation and interviewed the man. Police said the man appeared to have trouble making friends but did not find a history of guns.

Police have not formally named the suspect, who died following the attack.

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