Indiana State Police say a mother and toddler from Mississippi have died in a fiery crash at a road construction site on Interstate 70 west of Indianapolis.

Police identified the two killed Friday as 49-year-old Emma Bronson and her 3-year-old daughter Zacchia Bronson, of Pascagoula, Mississippi. The child’s father, 47-year-old Michael Bronson, was treated at a hospital and released. The drivers of the semi and the pickup remained hospitalized Saturday.

Investigators say eastbound traffic was stopped for construction when a semitrailer struck a pickup truck in the rear, knocking it off the road, then plowed into the rear of the Bronsons’ car, which burst into flames and struck a fourth vehicle.

Police and passersby were unable to revive the woman and child.

The highway was closed for about four hours yesterday.