January 29, 2015 11:30 AM

At least seven people, four of them children, were killed in a natural gas explosion Thursday at a maternity hospital just outside Mexico City.

The Cuajimalpa Maternal Hospital is reportedly on the verge of collapse with people still trapped inside, according to CNN.

The explosion occurred when a hose burst while a truck was supplying gas to the hospital, Mexico City Mayor Miguel Angel Mancera said.

At least 54 people have been injured, 22 of them children, the mayor told the Televisa network. Most injuries were minor.

One of the city’s webcams captured footage of the horrific incident, which has since been posted on Twitter.

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