We recently reported that five students on their way to a tour Humboldt State University in California were among those killed when a FedEx truck crashed into their tour bus.

Now, the mother of one of those students is suing FedEx.

FedEx Corp. was sued over an April 10 collision on a California highway that killed 10 people when one of the company’s trucks crashed into a bus taking high school students on a college tour.

Jennifer Bonilla, one of five students who died, was horribly burned and perished from her injuries some time after the crash, her mother said in a complaint filed yesterday in state court in Los Angeles.

The FedEx truck, which crossed the median and struck the bus head-on, was already on fire before the crash, according to the complaint. The company has a history of its trucks catching fire through mechanical problems, driver error and improperly loaded cargo, and FedEx has taken no steps to remedy this danger, according to the complaint.

The Federal Motor Carrier Safety Administration and the U.S. National Transportation Safety Board are investigating what caused the crash. FedEx, based in Memphis, Tennessee, has said it would provide “every resource necessary” to assist investigators.