A 70-year-old man is being held after two vans caught fire in a northern Minneapolis suburb, burning two young sisters.

The Anoka County Sheriff’s Office says the man is being held on a negligent fires charge.

Authorities say the man owned a van that caught fire about 7:15 a.m. Tuesday in a Walmart parking lot in Fridley. That fire spread to a second van with two girls ages 6 and 9 inside. Both girls were hospitalized with critical injuries.

The children’s mother was inside the Walmart at the time the fire reached the second van.