A fire following a possible gas explosion in a food truck Monday left three people with severe burns and needing life support, authorities said.

When fire crews arrived the fire already had been extinguished but three people needed life support at the scene before being transported to a hospital, the Sheboygan Fire Department said.

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The fire occurred shortly before 6 p.m. at Vollrath Park, which hosts food trucks on Mondays, news outlets reported.

Sheboygan sits along Lake Michigan about 60 miles north of Milwaukee.

Two state prisons in Utah were placed on lockdown Monday night following a large brawl at the Central Utah Correctional Facility located in Gunnison.

The Utah Department of Corrections said the fight involved 15 inmates, according to FOX 13 Salt Lake City. 

Five of the inmates involved were transported to a local hospital for treatment of their injuries. 

The severity of their injuries is unclear.

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The brawl between inmates appeared to be gang-related, according to the state Department of Corrections, and weapons were also allegedly used. The type of weapons involved in the brawl were not identified.

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The Utah State Correctional Facility in Salt Lake City was the second prison placed on lockdown in response to the fight. During a lockdown, the state DOC said inmates are restricted to their assigned cells and dormitories.

The incident remains under investigation.