More than 50 people were injured in Oxnard, California, after a commuter train struck a truck and derailed.
Three Metrolink train cars can be seen on their sides in helicopter footage broadcast on "America's Newsroom."
Emergency responders can be seen treating numerous injuries on the scene. The truck was fully engulfed in flames.
The crash occurred at about 5:45 a.m. local time as the train was heading from Ventura County to Los Angeles.
UPDATE, 10:30a ET: Adam Housley just reported that five train cars were affected, with three having tipped over.
No fatalities have been reported so far. More than 30 people have been injured, including two people who are in critical condition.
Housley said the crash occurred after a produce truck was abandoned on the tracks. The driver then fled and was apprehended about a mile away.
UPDATE, 11:30a ET: Will Carr reported on "Happening Now" that authorities have raised the number of injuries to 51, with four people in critical condition.
28 of the injured have been transported to six hospitals.
The produce truck driver was arrested.
UPDATE, 1:00p ET: Will Carr reports that the truck driver is in police custody. It's still unclear why the man left his truck on the tracks.
In a new video (above) from a witness, the truck can be seen engulfed in flames.
Officials are viewing the derailment as "successful" at this point, meaning there were no fatalities and the train cars stayed intact.
An NTSB team of investigators is expected to arrive from Washington later today, he said.
Stay tuned to Fox News for updates on the situation.