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house at usc. students posting signs of protest. >> it's a message to people that this matters. and i just hope that people come and read the signs and see the frustration and the anger. >> reporter: authorities now investigating multiple reports of assault inside. according to a usc department of public safety log, from the september 27th to october 20th, six different incidents of alleged drugging were reported at the fraternity. at least one involving an alleged sexual assault. >> usc needs to make a statement. i think the frat needs to be shut down and removed from campus of. >> reporter: lapd launching a n investigation involving four alleged victims. in a statement, usc saying it's received reports of drinks being spiked at a party, leading to possible drug facilitated sexual assaults. in recent months, fraternities at other big universities, including northwestern and missouri, facing similar allegations. tonight with that crowd and protest signs growing behind me,

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