Police say a citizen found the substance on Monday in Oakvale Green Park, located off Greenwood Avenue and south of Danforth Avenue.
Police searched the area and didn’t find any other suspicious substances.
Police are asking people in the area to remain aware and report any similar substances to police.
They also recommend that pets be kept on a leash.
Police also say anyone who spots a suspicious substance should not collect it or touch it but call police.