(CNN) Houston officers have arrested a man they say fired a gun at the car of a family of four after an apparent "road rage incident," igniting the newly-purchased fireworks inside.

Bayron J. Rivera, 18, is in custody and will be charged with four counts of aggravated assault, Harris County Sheriff Ed Gonzalez said Sunday. Rivera surrendered to investigators, he said.

The children, a 1-year-old and a 2-year-old, sustained "severe burns" Thursday night and had to be life flighted for their injuries, according to Deputy Tom Turner with the Harris County Sheriff's Office violent crimes unit.

Turner told reporters Thursday at the scene that two men had "exchanged words" and pulled into a gas station parking lot.

Both men got out of their vehicles and one of them took out a firearm, Turner said.

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