Guelph police Chief Rob Davis has launched an internal investigation after Tuesday's bizzare mix-up at a south end hotel when a woman initially believed to be dead, was later discovered to be alive.

Police say they received a call from a staff member at the Days Inn on Gordon Street, who believed a woman was dead in a room. Police arrived and determined the woman as deceased, sealing the room to protect the scene.

However, police say that forensic investigators later found the woman was alive but with very faint vital signs. She was then taken to the hospital and treated for non-life threatening injuries.

Davis says the incident will be thoroughly investigated and everyone who responded to Tuesday's incident will be questioned.

When asked about why paramedics weren't allowed to check for vital signs, Davis says it wasn't normal for them to make those calls. "I don't want to speculate what went through the officer's mind and to what degree they made their determination based on what they saw at the time. But that will come out as part of the investigation."