A British university said Wednesday that its students will no longer be allowed to throw their mortarboards into the air at graduation because of fear of injuries -- but offered to digitally add the caps into photos for free.

"The decision ... follows a number of injuries over recent years to graduates hurt by falling mortarboards," the University of East Anglia said.

"This is an unacceptable risk and we want to ensure no student's graduation day is ruined by the potential for avoidable injury," it said.

The university said that academic dress suppliers "often receive back damaged mortarboards" when students throw the hats above their heads.

The official photographers have asked students to mime throwing their hats and have offered to add the mortarboards in digitally.

The graduation hat-throwing tradition started in the US but has taken off worldwide and is often the only time that students wear academic gowns. One student had to be treated in hospital last year with a serious injury after being hit by a mortarboard.