Over 30 have banned the electric boards.

USA Today reports.

More than 30 colleges ban hoverboards amid safety concerns

Colleges and universities nationwide want students to stay grounded.

Due to safety concerns about the use of hoverboards — two-wheel, self-balancing electric boards — a growing number of schools are implementing campus or partial-campus bans on the devices. There have been reports of some spontaneously igniting during use or while charging and, on Dec. 16, the U.S. Consumer Product Safety Commission (CPSC) announced that it’s investigating 28 fires in 19 states caused by hoverboards. There have also been at least “70 ER-related injuries” from the scooters, according to the commission.

The bans and partial bans started in December and have since grown to more than 30 schools. Here’s an informal tally of those who’ve just said “no” — or mostly no — to the scooters. The number is growing, so keep an eye out for school emails and announcements.