Officers responded at about 2:05 p.m. Friday to the 12200 block of Frank Modugno Drive to reports of a stabbing, according to the Los Angeles Police Department.
Police said a man on a bicycle stabbed another man before fleeing the scene in an unknown direction.
AIR7 was over the scene as police established a perimeter in the area to locate the suspect. Several officers were seen in a standoff position at a motel near the train station. Aerial images also showed what appeared to be a man on the ground on the train platform. A white police canopy was later put up around that person.
The Sylmar/San Fernando station remains open and accessible at this time, Metrolink said in a statement.
No further details were immediately known.
This is a developing story. This article will continue to be updated as more information becomes available.
City News Service contributed to this report.