ORANGE COUNTY, Fla. — One person was killed and two children hurt in a multi-vehicle crash involving a dump truck on Florida's Turnpike on Monday morning.

• FHP: Driver of Hyundai lost control for unknown reason
• He was pronounced dead at Health Central hospital
• 2 children, ages 16 and 11, were hurt, one of them critically
• Get the latest with the Road Report

The crash happened at about 6:45 a.m. near Colonial Drive, and all four vehicles involved were traveling southbound, according to a Florida Highway Patrol crash report.

Troopers say that for an undetermined reason, the driver of a 2012 Hyundai sedan lost control and traveled into the path of the dump truck. That caused a chain-reaction crash.

The driver of the Hyundai, 40-year-old Timothy Toddy from Clermont, was taken to Health Central hospital in Ocoee, where he was pronounced dead.

He was a second-grade teacher at Windy Ridge K-8 School in Orange County, the school district confirmed Tuesday.

"We are deeply saddened to hear about the tragic loss of Timothy Toddy," said Lorena Arias, an Orange County Public Schools spokeswoman, said in a statement. "Grief counselors are available to help any student and staff needing to talk to someone."

Passengers Alana Sifre, 16, and Julissa Santiago, 11, both of Clermont, were hurt. Sifre was transported in critical condition to Orlando Regional Medical Center. Santiago was taken to Arnold Palmer Hospital for Children with minor injuries, according to the FHP crash report.

All in the Hyundai were wearing seat belts, troopers say.

The drivers of the other vehicles in the crash — the dump truck, a 2014 Ford SUV, and a 2014 Toyota Camry — weren't hurt, according to the report. None had passengers.