The parents of two University of Southern California Chinese graduate students slain near the campus last month have filed a wrongful death lawsuit against the university, saying the school misled them when it claimed that it ranks among the safest universities.

Ming Qu and Ying Wu, both 23-year-old electronic engineering students from China, were fatally shot April 11 while sitting in Qu's BMW in the 2700 block of Raymond Avenue. Wu was found in the passenger seat; Qu stumbled to the steps of a nearby home and collapsed. Los Angeles police say they believe the killings were the result of a robbery gone wrong. No arrests have been made.

On Wednesday, Wanzhi Qu and Xiahong Fei, Qu's parents, and Xuyong Wu and Meinan Yin, Wu's parents, filed the lawsuit against USC in a downtown Los Angeles court, seeking unspecific damages for the loss of their children.

DOCUMENT: Read the lawsuit

Their attorney, Alan Burton Newman, alleges international students apply to USC through the university's website.

In answer to questions about safety, the website states, "USC is ranked among the safest of U.S. universities and colleges, with one of the most comprehensive, proactive campus and community safety programs in the nation," the lawsuit alleges.

The suit notes that USC says it provides 24-hour security to campus and in surrounding neighborhoods.

"USC is not one of the safest U.S. universities and colleges and does not provide twenty-four hour law enforcement services in the surrounding neighborhoods and is in a high crime area," according to the suit.