Someone has smeared excrement on various buildings and surfaces of the University of Windsor.

Campus police are stepping up their vigilance in an effort to find the culprit.

University of Windsor spokesman John Coleman says some footage was captured on security cameras during the second incident, which happened last week.

"It was early in the morning. There was some surveillance taken, but unable to identify who it was," Coleman said.

Coleman said the person in the video is wearing a hoodie and it's impossible to identify them.

"We're putting extra patrols out there and trying to find out who this individual is," Coleman said.

Coleman says it's happened at least twice in the past three weeks.

"It's not humourous. It's not funny. It's a huge concern to everyone," Coleman said. "It's a beautiful campus at the University of Windsor, and that's the way we like to keep it."

Coleman said seats, signs and walls were struck and everything was cleaned immediately.