A man working on a helicopter at a Florida airport was killed Thursday after being struck by the blades, authorities said.

Deputies responded to the fatal incident at Brooksville-Tampa Bay Regional Airport around 3:30 p.m., the Hernando County Sheriff’s Office said in a news release.

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“The caller stated he and another individual were using a power cart to jumpstart a helicopter when, for an unknown reason, the helicopter suddenly jerked up and then came down,” authorities said.

As a result, one of the men was hit “in the head” by the chopper’s main rotor blades and “was killed instantly,” according to the sheriff’s office.

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The deceased individual was identified by authorities as Salvatore Disi and officials from the medical examiner’s office arrived to the scene “to remove the body.”

An investigation is ongoing.