MINNEAPOLIS (WCCO) — The Metropolitan Mosquito Control District resumed flights Tuesday, the first time since a pilot working for them was killed in a helicopter crash last week.

The National Transportation Safety Board also released a preliminary report about the crash. Witnesses say they saw the helicopter lose altitude and roll to the left just before going down.

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A GPS system was recovered from the crash and will be examined for more information.

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The Metropolitan Mosquito Control District have already treated 100,000 acres and have identified 25,000 to 30,000 more acres that need to be treated.

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In recent years, they’ve treated 150,000 to 200,000 acres total.