A security matter prompted closure of all DeVry University and Chamberlain College of Nursing locations in the Chicago area Monday, school officials said. "We were informed of a potential security issue involving our Chicago area campus locations," Chamberlain posted on its website. "For the safety & security of our students, faculty and colleagues, we are closing all Chicago-area Chamberlain and DeVry University campuses ... All Chamberlain and DeVry University classes are canceled. All clinicals will continue as scheduled at offsite locations." The statement from the school didn't say what kind of issue was being investigated but indicated law enforcement agencies were involved, WLS-TV, Chicago, reported.