Update: 5 Children Heading to Disney Killed in Fiery Florida Crash

Flames engulf vehicles after a fiery crash along Interstate 75, Thursday, Jan. 3, 2019, about a mile south of Alachua, near Gainesville, Fla. Highway officials say at least six people have died after a crash and diesel fuel spill sparked a massive fire along the Florida interstate. WGFL-Gainesville/AP

FORT LAUDERDALE, Fla.—A church van packed with children was headed to Walt Disney World when it got caught in a fiery pileup involving two 18-wheelers. Seven people, including five of the youngsters, died in the crash.

On Jan. 4, investigators tried to determine what triggered the accident, which happened outside Gainesville in clear weather on a straight, flat stretch of Interstate 75, a busy highway that connects Florida to the rest of the South.