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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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'Retribution' video linked to California shooting

The gunman's black BMW is pictured at one of the crime scenes. Credit: Reuters

A YouTube video thought to be linked to the shootings in California sees a young man claiming he will get "retribution" for a lack of interest shown in him by women.

The footage shows a young man complaining that it is "unfair" that he is still a virgin before threatening a mass slaughter of college students and Isla Vista residents.

"It's obviously the work of a madman," the sheriff said of the shooting. "There's going to be a lot more information that will come out that will give a clearer picture of just how disturbed this individual was."

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