The investigation involves drones, helicopters and a review of everyone who called 911 about the blazes, he said. "We're going to get to the bottom of what happened," he said, adding that investigators should have an answer to whether there was a "nefarious origin" in the coming days.

As of Sunday morning, the Long Island brush fire was 80% contained, but wind gusts of up to 40 mph continue to threaten the area. Here's the latest: