Blast ignites fire in hyperbaric chamber, kills 1

An Italian woman has died and her 4-year-old grandson is in critical condition after a hyberbaric chamber exploded at a South Florida clinic.

The Broward Sheriff's Office says 62-year-old Vincenza Pesce died early Saturday, a day after a blast caused a flash fire inside the chamber.

She was holding her grandson, Franchesco Martinizi, during the blast. He was being treated for a medical condition but authorities didn't immediately say what was wrong with him.

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Sheriff's spokesman Mike Jachles says Pesce was holding the boy to comfort him.

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Hyperbaric chambers are filled with 100 percent oxygen and can be used to treat diving injuries and other wounds.

Authorities are investigating the cause of the blast.