SAN MATEO, CA- A person on the tracks was fatally struck by a commuter train in San Mateo Monday night, according to a Caltrain spokeswoman.

Southbound train No. 190 struck a person who was on the tracks illegally in the vicinity of 25th Avenue at 8:12 p.m., Caltrain spokeswoman Tasha Bartholomew said in an email. There were roughly 500 passengers onboard at the time, according to Bartholomew.

Southbound train No. 190 and northbound train No. 193 were both held at the scene for investigation, but No. 190 was released at 9:11 p.m. and trains were single-tracking through the area as of 11 p.m..