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NASSAU COUNTY — Long Island officials gathered Wednesday to demonstrate fire safety techniques in the wake of a deadly and devastating Bronx fire.

Sunday’s blaze left 17 dead. It was started by a malfunctioning space heater. The fire and smoke spread as a door was left open.

Officials hope to use the tragedy to teach fire safety.

Wednesday’s lesson at the Nassau County Fire Academy demonstrated how quickly a fire from a misused space heater can engulf a room.