The main campus of Memorial University was filled Monday with ambulances, police cruisers and first responders — although nothing had gone wrong.

The university staged its first mock disaster in more than a decade to test how staff and students respond to emergencies, and to involve agencies that would be called for aid.

Co-ordinator Karen Alexander said a variety of scenarios are being deployed, from natural disasters to threats to students from an intruder.

"The things that we're going to be exercising in play today can respond to a chemical spill, a major incident with a research labs, [a] building on fire, an active intruder on campus, right on down to a IT computer failure," she told CBC News.

The full-day exercise is the first event of its kind on campus since 1999.