Officials at the University of Colorado say they received two suspicious packages Monday at the Denver-area school.
The first package arrived early in the morning and was slipped under the door at a campus building while it was mostly empty. People were not allowed into the building until the threat was cleared. A spokeswoman says she does not know what the package was or who it came from
The second package was addressed to a person in a separate building and came to the school's central mail facility.
Weeks before, Holmes quit a 35-student Ph.D. program in neuroscience for reasons that aren't clear. He had earlier taken an intense oral exam that marks the end of the first year but University of Colorado Denver officials would not say if he passed, citing privacy concerns.
At a news conference, university officials refused to answer questions about Holmes. "To the best of our knowledge at this point, we think we did everything that we should have done," Donald Elliman, the university chancellor.
Police have said that the suspect in a shooting that killed 12 people during an early Thursday showing of the new Batman movie ordered ammunition online and received at least 50 packages in four months at his home and at school.