A "suspicious" powder that prompted 35 people to evacuate the Theta Chi fraternity house at the University of Central Florida is a protein powder, UCF police said Friday.

Campus police said two tests of the substance indicated it was a protein powder.

The Theta Chi house was evacuated around 11:30 a.m. after UCF police said a cleaning crew preparing the house for a recruitment event found a cup containing the powder.

Orange County fire officials began testing the powder out of an abundance of caution.

Northbound traffic has been shut down on Greek Park Drive as crews investigate.

At Greek Park responding to suspicious powder at Theta Chi. Don't think it's serious, but NB traffic on Greek Park temporarily shut down. — UCF Police Dept. (@UCFPolice) August 7, 2015