A student spotted the clown with the 'Chainsaw weapon' at Brunel University in Uxbridge London.

A student who dressed as a chainsaw-wielding clown on a university campus has apologised amid rising reports of similar pranks.

The self-described YouTube prankster, who gave his name as Kenny, said he was "only chasing his friends" in a video shot on Brunel University grounds.

Meanwhile, reports of "creepy clown" sightings have continued to rise.

Police have increased patrols outside some schools, and asked fancy dress shops to remove clown masks from sale. and issued a warning.