Fourth person dies after Amtrak train derails in Missouri

• The incident occurred after the train struck a dump truck at a public crossing in Mendon, causing several cars to derail, Amtrak said.

Matt Daugherty, director of business development at Lifeflight Eagle Air Ambulance, told Axios the ambulance service's four helicopters all responded to a "mass-casualty incident" outside of Mendon, Missouri.

• Eric McKenzie, the superintendent with Chariton County Ambulance Service, told CNN there were multiple fatalities. McKenzie did not respond to Axios' request for comment.

Details: LifeFlight Eagle transported patients to trauma centers in Kansas City and Columbia, Daugherty told Axios.

• He said multiple other air-ambulance organizations from Missouri responded to the incident.
• Nine patients were taken to University Hospital in Columbia, Mo., Eric Maze, a communications strategists for University of Missouri Health Care, told Axios.
• Maze said he did not know the conditions of the patients and it's unclear if the hospital will receive anyone else.

The big picture: The derailment in Missouri occurred just one day after an Amtrak train collided with a car in Brentwood, California, killing three people and injuring two others, ABC 10 reported.

Editor's note: This is a developing story; please check back for updates