BERKELEY — A 21-year-old UC Berkeley student has been arrested on suspicion of sexually assaulting his fraternity brother, authorities said Thursday.

Jordan Schaer, a computer science major from Pittsburgh, Penn., was charged with attempted sexual penetration by foreign object and sexual battery by restraint for the alleged assault on Feb. 13 at the Alpha Epsilon Pi fraternity house, according to authorities. Both charges are felonies.

The victim said he woke up as Schaer reached his hand under the victim’s pants and groped him, Berkeley police Officer Kenneth Tu wrote in an affidavit filed in Alameda County Superior Court.

The victim reported “no prior dating or sexual relationship with Schaer,” and did not consent to Schaer being in his room, Tu wrote. They are both members of the fraternity and live in the house at 2430 Piedmont Ave.

Schaer’s attorney, Kellin Cooper, described the sophomore as a “super kid,” who has served as an internal vice president of the Berkeley Jewish Student Union. Cooper called the allegations baseless, and expects his client will be exonerated.

“The basis for arresting and charging Jordan Schaer is simply because somebody said something happened,” Cooper said. “There is absolutely no other evidence, just a verbal accusation. All too often the police rely on a verbal accusation and become close-minded to what really happened.”

Schaer was arrested early on the morning of Feb. 13 but has since posted bail.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.