TOPEKA, Kan. (AP) — Authorities say a Kansas father and son were injured when their car exploded.

The explosion Sunday near Topeka had such force the roof of the car was peeled back.

Authorities say Jacob Schell and his 4-year-old son, Roman, were injured in the explosion.

Jacob Schell’s brother, Alex, told The Topeka Capital-Journal the car exploded because of fireworks inside. He said the family had been celebrating the Fourth of July and the two victims were headed home when fireworks they had in the car went off.

They were flown to the University of Kansas Hospital, where their conditions were not immediately available.

The Kansas Fire Marshal is investigating.

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TOPEKA, Kan. (AP) — Authorities are investigating after a car explosion in Soldier Township in Topeka peeled back the roof of a car and sent two people to the hospital.

State Fire Marshal’s Office investigations chief Rose Rozmiarek says emergency crews and law enforcement responded Sunday morning to an explosion inside a vehicle in the Oakland Expressway bridge. Authorities said a car was traveling southbound when it exploded.

The Topeka Capital-Journal reports the driver and passenger, whose identities have not been released, were transported to a Kansas City hospital.

Rozmiarek said their conditions are unknown and the cause of the explosion is under investigation.