Officials at Indiana University-Purdue University Indianapolis have ended a campus alert that had warned students to remain indoors following an armed robbery near the Indianapolis campus.

School officials said in an update about 4:30 p.m. Tuesday that they had lifted the roughly 90-minute "shelter in place" alert for students and staff.

IUPUI spokesman Rich Schneider says that means students can leave campus buildings and resume what they were doing during finals week at the campus just west of downtown.

Indianapolis police spokesman Officer Rafael Diaz says officers could not find the armed man who robbed a person near an off-campus apartment and fled toward campus. The man was reportedly carrying a black handgun.

Diaz says there will be an increased police presence on the campus Tuesday evening and night.