A 67-year-old Arizona man died Wednesday evening after suffering an apparent heart attack while riding on Metro’s Red Line, a spokesman for the transit agency said.

Metro spokesman Dan Stessel said the man, whose name was withheld pending notification of his next of kin, became unresponsive as the train pulled into Union Station on its way to Glenmont.

Metro Transit Police and the D.C. Fire and Emergency Medical Services Department were called to the scene at 5:40 p.m., Stessel said, and workers performed CPR on the man before bringing him to a local hospital.

While authorities tried to revive the man, hundreds of his fellow passengers disembarked and the transit system began single-tracking around the train.

The man was pronounced dead at 6:34 p.m., Stessel said.

— Victoria St. Martin