An investigation began Tuesday north of Fort McMurray after police received a tip on a 911 line, said RCMP Const. Christina Wilkins.
"We received threats that there were harmful substances," Wilkins said, although she couldn't provide details of what kind of substances were mentioned or the nature of the threats.
She said resources from outside detachments including police dogs, explosive teams and the RCMP's Integrated National Security Enforcement Team were called in to help with the investigation.
Wilkins says no harmful substances of any kind have been recovered. Police can't confirm the existence of any explosive device or any material that would endanger the public.
"We don't have a substance. We don't have anything to confirm there actually was a threat, but we investigated that threats were made and uttered."
Lance Huntington, 49, of Kamloops, B.C., has been charged with uttering threats and uttering false messages. He is to appear in court June 19 in Hinton, Alta.