The arrow-shooting death of Michael Gibbon, 60, in Kitchener, Ont., is now being treated as a homicide, Waterloo Regional Police Service says. 

A post-mortem examination was done Tuesday morning and showed Gibbon was killed by an arrow shot into his chest. The exam also showed it wasn't a self-inflicted wound, turning the suspicious death investigation into a homicide case. 

In a release, police said they are dedicating considerable resources to the investigation, working around the clock to collect information and evidence from the crime scene and canvassing neighbours.

"The investigators received a number of tips and a lot of information as a result of the canvass," said Staff Sgt. Mike Haffner. "They are following up those leads as we speak and are hoping to put some conclusion to this investigation." 

Gibbon was found Monday morning around 7 a.m. ET on the front corner yard of a home at 387 Margaret Ave. 

Emergency medical responders took him to hospital where he later died from his injuries.

​Eleven area schools were under a "hold and secure" state for much of the day Monday as police conducted an investigation along Margaret Avenue. Classes continued but no one was allowed in or out of the schools.

Mike Haffner Waterloo Region police

Staff Sgt. Mike Haffner says officers are talking to residents in the area around the crime scene for information that may relate to the case. (Amanda Grant/CBC)

"This is a concerning set of circumstances for our organization, let alone the public," Haffner said. 

"We know that someone out there knows who is responsible or may have information of who is responsible for this tragic set of circumstances," he added. 

It's unclear what the motivation for the attack might have been and police are not ruling out any possibilities. In a release, they also said the risk to public safety is not known, and that people should remain vigilant and aware of their surroundings. Any suspicious activity should be reported to police.