PHILADELPHIA (AP) — A Philadelphia university is apologizing for an erroneous message warning of an active shooter on the campus. Thomas Jefferson University says a “resolvable system error” during a routine test of the school’s JeffAlert system sent out the alert at 10:18 a.m. Sunday about the campus in the East Falls neighborhood, which was formerly known as Philadelphia University. The school vows to take action “to ensure that this does not happen again.”