A Delhi resident contacted police after noticing a drone hovering at the rear of their home.
Norfolk OPP responded to the suspicious incident on Sovereen Street at just after 6 pm on Tuesday.
The drone, with a flashing green light, was outside the rear windows and door of the residence, police said in a media release.
After the drone left, the homeowner saw it hovering near the windows of neighboring homes.
Norfolk OPP officers were unable to locate a drone operator in the area at the time.
Police are continuing to investigate. Anyone with information about the incident is asked to call Norfolk OPP at 1-888-310-1122 or Crime Stoppers at 1-800-222-8477. People can also leave an anonymous online message at the tips link at www.helpsolvecrime.com.