On April 10, a defibrillator was left in a hallway while paramedics were taking care of a call inside an apartment building at 370 Keele St., south of Finch Avenue.
Police are trying to locate the missing equipment.
The defibrillator is inside a small nylon bag with a small beige monitor on top of the case with EMS clearly printed on it.
Police are concerned because if used irresponsibly it could cause bodily harm and should only be used by trained professionals.
Anyone with information is asked to call police at 416-808-3100 or Crime Stoppers anonymously at 416-222-8477.