Five individuals -- four men and a teenage boy -- have been arrested in connection with the gang-rape of a 16-year-old girl at a Sydney house party earlier in the year, New South Wales Police have said.The incident was filmed on a GoPro-style camera, which was later seized by authorities in relation to an anti-graffiti operation. The sexual assault was discovered by police when viewing footage from the device. The party took place in the working-class Western Sydney suburb of St. Clair in May of this year, a NSW Police media release said. Police say that up to eight males were in the room when the girl was assaulted, with a number of them sexually assaulting the girl. As of Wednesday, police had arrested four men in their twenties and one 17-year-old boy.