Officials with the American Meteor Society and NASA say a double boom heard in multiple states Saturday afternoon was a 3-foot meteor entering the atmosphere near the Massachusetts and New Hampshire border. Police and fire agencies received reports of buildings shaking. And videos of the double boom were posted on social media. NASA officials confirmed that the meteor was natural material, not a satellite or space debris. It entered the atmosphere at 2:06 p.m. NASA also said the meteor was travelling at about 75,000 mph and likely fragmented about 40 miles above the ground. The agency estimated that the energy released when it broke up was equivalent to about 300 tons of TNT.