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PENSACOLA (CBSMiami/AP) — In April, an explosion at a Florida jail killed two inmates and injured 200 more. However, a grand jury looking into the deadly case said there isn’t enough evidence to bring criminal charges.

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The blast happened at the Escambia County Jail in Pensacola, but mystery surrounded what caused it.

It was first reported that the explosion was caused by a natural gas leak, but state investigators and federal authorities said they had found evidence revealing a crime was committed.

In the end, jurors noted that a spark from an unknown source ignited natural gas and caused the explosion.

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In a report released by the State Attorney’s Office on Thursday, grand jurors commended guards and the Escambia Sheriff’s staff for their work during the explosion and flooding.

The grand jury made a number of recommendations for the county to consider as it builds a new jail.

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