National Transportation Safety Board officials were expected in rural Missouri on Tuesday to investigate an Amtrak train derailment that killed three people.

Amtrak said about 275 passengers and 12 crew members were aboard a train en route to Chicago from Los Angeles when it hit a dump truck on Monday afternoon, killing the driver. 

Two train passengers also died when seven of eight cars on the Amtrak Southwest Chief train came off the tracks, said Cpl. Justin Dunn, spokesperson for Missouri State Highway Patrol.

The crash happened at 12:42 p.m. in Mendon, Missouri, about 84 miles northeast of Kansas City. It follows another Amtrak train crash Sunday in northern California where three people died. 

Here’s what we know Tuesday:

What happened?

The crash and derailment happened on a gravel road in Chariton County, southwest of Mendon, at an “uncontrolled intersection” with no traffic lights or electronic controls, said Lt. Eric Brown of the Missouri State Highway Patrol on Monday.