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Justin Bieber's Bodyguards Accused Of Battery ... Yes, Again

OSLO, NORWAY - APRIL 17:  Justin Bieber performs at the Telenor Arena, on the second night of the Norwegian leg of his 'Belie
OSLO, NORWAY - APRIL 17: Justin Bieber performs at the Telenor Arena, on the second night of the Norwegian leg of his 'Believe' tour on April 17, 2013 in Oslo, Norway. (Photo by Julian Parker/UK Press via Getty Images)

Justin Bieber's bodyguards are under investigation YET AGAIN for allegedly roughing up someone who was trying to take his picture ... TMZ has learned.

Law enforcement sources tell TMZ ... Bieber and co. were at a hookah lounge in Hollywood when someone -- not a paparazzo, just a regular person -- tried to snap a pic of the Biebs. We're told one of Bieber's bodyguards tried to stop the person from taking pics and some sort of scuffle ensued. 

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