The youngest son of Michigan Democratic Rep. John Conyers Jr. was reported missing Wednesday night in Houston, hours after he failed to show up at a scheduled meeting with his girlfriend, according to the congressman’s staff and media reports.

Carl Conyers, 21, a student at the University of Houston, was last seen by a roommate on Tuesday, Fox News and Houston’s CBS affiliate KHOU 11 News reported Thursday.

“Rep. Conyers and his family ask for privacy as they work through this situation of uncertainty and ask that anyone with knowledge of their son’s whereabouts, contact the Houston Police Department immediately,” spokeswoman Shadawn Reddick-Smith said in a statement.

#BREAKING US Rep. John Conyers’ son reported missing in Houston since Tuesday. Family says Carl Conyers may have been seen @ Rice U #KHOU11 pic.twitter.com/ltrHe2eJZT

— Stephanie Whitfield (@KHOUStephanie) November 17, 2016

His mother, Monica Conyers, said her son told roommates he “had a bad day” Tuesday, the news station reported.

His girlfriend, Daisha Lewis, said he had stopped answering his phone by Wednesday morning, KHOU 11 reported.

After he missed their meeting on campus, she and friends checked his apartment and found some clothes and other items missing, she said, according to WWJ Newsradio 950 in Detroit.

“I’m very worried,” John Conyers told The Detroit News Thursday. “It’s very unlike him. He’s a very stable young guy.”

Conyers was at the Capitol Thursday and his wife Monica was in Texas, the newspaper reported.

Houston police are working with the FBI, Secret Service and a private search group to locate Carl Conyers.

John Conyers Jr., 87, has been in Congress since 1965 and is the longest-serving incumbent member of the House.