PHOENIX (KSAZ) - Firefighters say the 20th floor of the Collier Center in Downtown Phoenix was evacuated as a precaution Friday, after an envelope containing a suspicious substance was found.
According to Capt. Rob McDade, two people came in contact with the suspicious substance on the 20th floor.
In a later statement, Phoenix Police Sergeant Tommy Thompson said the suspicious substance, which was in the form of a powder, was eventually determined to be non-dangerous, and people who were evacuated later returned to work.
An investigation by Phoenix Police is underway.