Five brothers seriously injured in propane tank explosion caused by cigarettes

Five Minnesota brothers were seriously injured in a propane tank explosion.

The siblings, ages 6 to 14, suffered severe burns in an explosion at a warehouse north of Bagley, Minnesota, at approximately 12:30 a.m. on Monday, Nov. 4, the Clearwater County Sheriff’s Office said, per CBS News and local outlets KROC-AM news And The Minnesota Star Tribune.

Preliminary investigation shows that the explosion occurred after a leaking propane tank in the storage unit was accidentally ignited by an adult male lighting a cigarette.

Brothers Keegan, Kaeto, Braedyn, Tannen and Zander Ritchie were left in critical condition by the explosion and were transported to a burn center in Hennepin, Minnesota, for further care, officials said. GoFundMe page set up for the boys by their sister Kyra Frank.

“My five little brothers were involved in an explosion,” Kyra wrote. “All prayers are needed and appreciated. My mother is a single working parent and is now taking time off to be with her boys. She can use all the help she gets. We know very little at this time, but will provide updates as we hear.”

According to the GoFundMe page, the brothers suffered burns ranging from 5 to 55% in the incident.

Authorities shared that the man who lit the cigarette also suffered serious burns in the explosion, according to CBS and KROC-AM News. He is reportedly the brothers’ father, per The Minnesota Star Tribune.

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In an update shared on their GoFundMe page, the brothers are said to be in stable conditions with “a long road ahead.”

“The surgeon told us that they will all need surgery at some point during this process,” their sister Kyra continued. “The stays will be long, the medical bills will be high and mom won’t be able to work. We have increased the donation goal and we sincerely appreciate all your help and prayers.”

So far, more than $43,000 has been donated to the GoFundMe page for the brothers.

PEOPLE have contacted the Clearwater County Sheriff’s Office for further comment.