Elangovan is 6-foot-1, 195 pounds, and has black hair and brown eyes. He was last seen wearing a long black wool coat, a long-sleeved blue T-shirt, and boxer shorts.

Aravind Elangovan, 19, left his home on Harvard Street in Longmont, Colo. at about 11 p.m. Friday, according to a statement from the Longmont Department of Public Safety. Officials there said he has “various mental conditions.”

A Brown University student who had been taking a semester off has not been seen since Friday night, when he left his family’s Colorado home without pants, shoes, or his wallet, police and his family said.


“A combination of the manner in which he left the house, the manner in which he was dressed and his mental impairment, increase Aravind’s risk to himself,” public safety officials said in a statement.

Police said Elangovan has no vehicle, wallet, identification, or cellphone, and they believe he “may be trying to make his way” back to Brown.

Sharmila Elangovan said her son skipped several years of elementary school and was 16 years old when he started college. He is studying computer science at Brown, and he took the semester off to develop software as part of a senior project.

“Very smart and very mature,” she said. “Even when he was young, he was very mature.”

She said her son spent part of the semester in Providence, but in March, some of his friends said he was “freaking out” and were concerned about him. Sharmila Elangovan and her husband decided to bring him home to Colorado.

“He’s a quiet person,” she said. “He doesn’t do any such behavior. He’s never done it before.”

Brian Clark, a spokesman for Brown University said they are assisting as Longmont officials investigate.

Felicia Gans can be reached at felicia.gans@globe.com. Follow her on Twitter @FeliciaGans.