An official at the authority says that the fireball broke up at a speed above 120,000 km per hour

NASA confirmed that a fireball passed over Massachusetts at 2:06 p.m., releasing a blast of energy equal to what it said was an estimated 300 tons of TNT.

Meteor was travelling at 75,000 miles per hour (more than 120,000 km/h) at an altitude of 40 miles when it broke apart