Green Line trains shared a track for more than 30 minutes Sunday evening after a man wandered onto the tracks at the U Street Metro station. There were initial reports that the man had been struck by a train, but Metro now says it does not know whether he was hit.

Metro spokesman Richard Jordan said it is unclear how or why the man was on the tracks, but that he escaped the incident with minor injuries — if any.

“He appears fine,” Jordan said. “He walked to the ambulance on his own and we’re still trying to figure out how he got onto the tracks.”

Jordan said it was too early to tell what motivated the incident, but that alcohol may have been a factor. The man was taken to an area hospital to be evaluated, Jordan said.

The incident delayed trains in both directions, causing Green Line trains to single-track between Georgia Avenue-Petworth and Shaw-Howard University.

Bystanders reported a large police presence in the area, but Metro Transit Police said units had cleared the station shortly after 5 p.m.

The single-tracking concluded about 5:15 p.m, but Metro said residual delays were expected in both directions.