Mist in ANU science room

ACT Fire & Rescue are inspecting a science room filled with mist at the Australian National University.

Crews say the mist is a combination of helium and nitrogen.

It's believed the gases may have been leftover from experiments.

An alarm system was triggered at 00:42am.

Three pumpers, the Hazardous Materials Unit, Breathing Apparatus Van and two commanders are on scene at North Road.

Update to follow.