URBANA, Ill. (AP) — The University of Illinois' flagship campus has broadened its ban on hoverboards to cover all of its buildings and other campus facilities.

The university last week told students the two-wheeled scooters were prohibited in campus housing but widened that restriction Tuesday.

A university news release said the ban was put in place over fire-safety concerns related to the batteries that power hoverboards. Some have caught fire,

Students are still allowed to ride hoverboards outdoors.

The University of Illinois-Chicago last week was considering a similar ban.

At least 20 U.S. universities have banned or restricted hoverboards in recent weeks.

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