A man died in the hospital Monday evening after being stabbed on the Metro Red Line subway train in East Hollywood the same day.
Firefighter-paramedics responded to the station at 9:20 a.m. The victim was stabbed in the neck as he entered a Red Line train headed to Union Station, according to Metro officials.
He was pronounced dead about 6:36 p.m., according to the Los Angeles Sheriff's Department.
Los Angeles County Sheriff's deputies said they were looking for a younger man in his 20s, but were still working on a more specific description Monday evening.
The Vermont/Santa Monica Station (map) was closed for the investigation, but reopened later Monday morning.
Many riders said they were more aware of their surroundings after hearing of the incident.
Gladys Mancillas admitted she wears her headphones on the train often, but said she was going to change that after hearing of the stabbing.
"I do it so people don't talk to me," she said. "I think from now on, I should be more aware of my surroundings. I'm so used to riding the Metro and nothing has really happened to me."
The Los Angeles County Sheriff's Department was investigating whether there was a fight before the victim was stabbed.
Deputies had also been looking into whether an emergency call button -- which each car is equipped with -- was used to alert the train operator, who called the sheriff's department for help.
Each car is also equipped with surveillance cameras, which investigators were looking through Monday evening.