US to factories, sellers: make sure hoverboards are safe

In a letter to manufacturers, importers and retailers, U.S. regulators said they will seize or recall any of the of the two-wheeled, self-balancing scooters, which were a huge hit this holiday season, if they fail to meet federal safety standards.

Concerns that lithium-ion batteries inside the hoverboards could spark a fire have led to bans by several airlines and college campuses.