Emergency crews were scrambling after a spill at a Saskatoon post office building Friday morning. (Dan Zakreski/CBC)

Emergency crews in Saskatoon were called to a Canada Post building Friday morning after an unidentified fluid was spilled on a number of workers — but it turned out to be harmless.

Investigators quickly determined it was hydrogen peroxide and there was no serious health risk — but for a while, crews were scrambling.

The call came in around 8:15 a.m. CST from the Canada Post distribution building at 817 51st St. E.

People at the building said a package was leaking a fluid onto letters in the mail-sorting area.

Eleven workers got some of the fluid on their hands and noticed their skin was turning white.

The building was evacuated and employees were put onto buses to stay warm.

None of the staff suffered from any pain or required any medical treatment, fire officials said. A good washing with soap and water was all that was needed.

The Saskatoon fire department said Canada Post is planning to put out a statement telling the public that the mail that came in contact with the product may already be out through the delivery system.

If anyone notices the product, which is similar to the texture of petroleum jelly, on packages or letters in their mail, they simply need to wash with soap and water, the fire department said.