"It's just a horrible scene, I must tell you. We are extremely concerned about the passengers who are still on the train, we are still evacuating people. We have multiple injuries and multiple fatalities at this time."
8. Close of firefighters rescuing people
9. Wide of crash scene
10. SOUNDBITE (English) Pablo Espinoza, Train passenger:
"Yeah, I was sleeping, I was supposed to be, I'm on vacation, I'm travelling and I just hear this impact and everyone was screaming and everyone with blood all around. Just crazy, crazy."
11. Various of firefighters taking a victim away on a stretcher
12. Wide of triage area
ABC - No Access North America/Internet
September 12, 2008
13. Aerial; wide of crash scene
14. Aerial; emergency crews working on top of overturned carriage
15. Various aerials; rescuers at triage centre
16. Aerial; wide of crews removing victim from wreckage
ABC - No Access North America/internet
September 13, 2008
17. Wide of wreckage
18. Close on mangled part of train
19. Close on overturned train car
20. Wide of overturned train car
21. SOUNDBITE: (English) Antonio Villaraigosa, Mayor of Los Angeles
"There's nothing that I could possibly say tonight to comfort those who have lost a loved one."
Emergency crews worked desperately through the night and into Saturday morning, ripping into a mangled train car to search for an unknown number of people trapped in a horrific train wreck in Los Angeles.
A Metrolink commuter train carrying 222 people collided head-on with a freight train on Friday afternoon, killing at least 12 people and injuring about 135.
The death toll was expected to increase as firefighters dug deeper into the wreckage.
Firefighters put out a fire under part of the train and pulled people from the passenger car, which was rested on its side with the Metrolink engine shoved inside it.
Fire Chief Douglas Barry said heavy equipment was brought in to take apart cars, including one that some victims still trapped inside.
"There's nothing that I could possibly say tonight to comfort those who have lost a loved one," Mayor Antonio Villaraigosa said, adding that it was the worst accident he had ever seen.
Dr. Marc Eckstein, medical director for the city Fire Department, said 135 people were transported to hospitals - about 85 of them in serious or critical condition.
In the initial hours after the disaster, firefighters treated the injured at three triage areas near the wreck, and helicopters flew in and out of a nearby landing area on medical evacuation flights.
Rescuers worked atop the wreckage and through breaches in the passenger car to reach victims.
Dazed and injured passengers sat on the ground.
"Everyone was screaming and everyone with blood all around. Just crazy, crazy," said Pablo Espinoza who was on the passenger train.
Metrolink spokeswoman Denise Tyrrell said the Metrolink train left Union Station in downtown Los Angeles and was headed northwest to Moorpark in Ventura County.
"It's just a horrible scene," said Tyrrell.
"I must tell you we are extremely concerned about passengers who are still on the train, we are still evacuating people. We have multiple injuries and multiple fatalities at this time," she explained.
The trains collided about 4:30 pm local time (2330 GMT) in the Chatsworth area of the San Fernando Valley.
Union Pacific spokeswoman Zoe Richmond said it was common in California for freight and commuter trains to share the same track.
The crash happened in an area where the tracks form a �U� shape, about 2,500 feet (760 meters) wide. At the top of the bend is a 500-foot (150-meter) long tunnel that runs beneath Stoney Point Park, popular with climbers for its large boulders.
On the north side of the tunnel, there is a siding, a length of track where one train can wait for another to pass, Tyrrell said.
The federal investigation into the crash will be headed by the National Transportation Safety Board, said Steven Kulm, a spokesman for the Federal Railroad Administration.
The FRA will conduct a review of whether any federal rail safety regulations were violated.
Prior to Friday, the worst disaster in Metrolink's history occurred on January 26, 2005, in suburban Glendale when a man parked a gasoline-soaked SUV on railroad tracks.
A Metrolink train struck the SUV and derailed, striking another Metrolink train traveling the other way, killing 11 people and injuring about 180 others.
Juan Alvarez was convicted this year of murder for causing that crash.