Looks like a broken door and card swipe machine allowed the man to enter the building without a GOCard (read: GWorld).
DCist's report pretty much sums things up:
"At 3:40 a.m. on Saturday morning, an assailant described as a black male between 17 and 20 years old allegedly attacked a female student, forcing her off a public balcony and into a common room, where he threatened her with a gun and sexually assaulted her."What do you think? Would armed campus police have prevented this? Or should we just ensure current security measures are followed out?