A 44-year-old man was fatally struck Wednesday by a Metro train after he jumped in front of it as it traveled northbound to Gallery Place on the Yellow Line, Metro officials said.

The incident began around 8 a.m. and caused about three hours of delays for morning commuters as the medical examiner and emergency personnel worked to clear the scene. Passengers on the train were offloaded through the doors of the train into the Mt. Vernon Square station.

Riders reported crowded platforms and rail cars, and delays as trains single-tracked for a time between Mt. Vernon Square and Archives stations.

Delays were also paired with heavy crowding at Pentagon, Pentagon City and other stations, as multiple trains disgorged riders onto platforms that were already packed. Passengers posted photos on Twitter showing a jammed platform at Pentagon, while at one point crowding at Pentagon City was so severe that the lines stretched up the escalators and toward the fare gates.

Normal rail service on the Yellow Line resumed at 11:26 a.m.

This is the second such suicide this year on the Metro system. A woman intentionally stepped in front of a train at Ballston last month and was killed by an Orange Line train.

Metro has tried to deal with suicides on its rail system by installing signs in stations that offer passengers a crisis help line number.