The search for a missing Duke University student has expanded nearly three days after he never made it home from a house party.

Michael Doherty, 20, was last seen around 1:30 a.m. Sunday at party with 25 other childhood friends in Franklin, Massachusetts. His parents reported him missing when he did not come home from the gathering, according to news station NECN.

Authorities enlisted dogs, boats, helicopters and drones to search the woods nearby his home for him. They have since expanded the search efforts into the neighboring town of Bellingham.

Police said Tuesday that they found the Duke University junior’s shirt and shoe while searching a stream near his house. The second shoe was found Monday near a golf course, according to news station WBZ-TV.

According to officials, Doherty’s phone has not shown any activity since he went missing. His family told police that Doherty texted his brothers on the night he went missing asking for a ride, but they had already gone to sleep.

“I can’t even imagine what these poor parents are going through, their family, their extended family, the friends, it’s unimaginable,” Franklin Deputy Police Chief James Mills said. “We’re doing our very best with all the assets to help recover Michael and find him safely.”