Law enforcement agencies continued the search on Saturday for a missing University of Minnesota student who was last seen Tuesday night.

David Michael Miller, 20, was last seen leaving Wilkins Hall, a student dormitory in the northwest corner of campus, near Dinkytown, about 9 p.m. Tuesday. Surveillance footage appeared to show him walking west, toward Interstate 35W, said University Police Chief Matthew Clark.

But there has been no sign of Miller, who is described as 6 feet 1 and 175 pounds, with green eyes and brown hair. He was wearing dark pants and a dark jacket at the time he disappeared, authorities said.

On Saturday, U police scoured the same block-by-block areas of the Dinkytown campus as in the previous day’s search, according to spokesman Steve Henneberry. Officers were working with Miller’s family on potential leads, Henneberry said, but were not conducting additional interviews. The Hennepin County Sheriff’s Office also continued its boat patrol on Saturday.

During searches over the previous two days, seven law enforcement agencies searched the U’s campus and Mississippi River by boat, used police dogs and put drones and a State Patrol helicopter in the air to search for the third-year bioscience major from St. Peter, Minn.

Officers from the Minneapolis and St. Paul police departments, the Ramsey and Hennepin County sheriff’s offices, the State Patrol and Metro Transit police set out from a command post at 11th and University avenues SE. On Friday, officers conducted a “grid search,” meaning each officer had an assigned area “that is thoroughly searched,” Clark said.

Tips can be phoned into the U’s Police Department at 612-624-2677.

Miller was reported missing after his roommates said he didn’t come home Tuesday night and then didn’t show up for a final exam the next morning.

Before his disappearance, Miller’s roommates reportedly didn’t notice anything amiss. “That’s the unusual thing: They didn’t say anything about him having emotional issues,” Clark said.

Miller left behind his phone, Clark said, complicating the task of finding him. And so far, he said, U police have been unable to track his movements on the campus network of roughly 2,000 surveillance cameras.

“We don’t have a ton of good information,” Clark said Friday. “We are hoping for a positive resolution.”