PITTSBURGH (KDKA) — Investigators continue to look into the cause of a house explosion in Brentwood.

Around 5 p.m. Thursday, a large blast rocked the basement of a home on Tuxey Drive.

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It was so strong, the back of the home collapsed.

Frank Mihalovich, the 69-year-old president of Brentwood EMS, was in the home at the time.

He was able to get out on his own and was waiting in the yard with severe burns when his fellow EMS workers came to his aid.

They were stunned to find their friend and co-worker on the other end of the 911 call and are now praying for the best.

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Mihalovich is a former police officer and ran a business called Frank’s Guns out of his home.

Brentwood police don’t think the guns had anything to do with the explosion, instead pointing to natural gas. However, People’s Gas spokesperson Barry Kukovich told KDKA-TV by phone that the explosion last night was not natural gas-related, nor did they find any leaks.

They are working with the ATF, bomb squad and Fire Marshall to determine the actual cause.

Mihalovich was rushed to UPMC Mercy where he remains in critical condition.

Friends say he was very active in the community and would do anything for anyone.

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