A man was struck by a Metrorail train and killed while walking on the tracks near the Arlington Cemetery station, authorities said.

The incident occurred shortly after 8 p.m. on tracks used by the Blue Line.

Metro said it was operating trains in both directions on a single track following the incident,

It was not clear why the person was on the tracks.However, Metro transit police said surveillance cameras appeared to show that he deliberately went onto the track bed.