LOS ANGELES (CBSLA.com) —A judge Tuesday asked that lawyers amend a wrongful death lawsuit filed by the parents of two Chinese graduate students who were fatally shot during a botched robbery in April.

23-year-old engineering students Ying Wu and Ming Qu were killed April 11 while they were sitting in Qu’s parked car off-campus in the 2700 block of Raymond Avenue.

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The victims’ parents sued USC for not disclosing that the campus is in a high-crime area.

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Judge Michael Johnson expressed reservations about the parent’s arguments and gave their lawyers 20 days to bring an amended complaint.

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Bryan Barnes and Javier Bolden have been charged with the killings.