The Federation of Quebec Maple Syrup Producers believe several million cans of stolen maple syrup may be sitting on U.S. grocery shelves.

Quebec police arrested four men in connection with the robbery of 6 million pounds of maple syrup stolen from a Canadian warehouse in a heist spanning just under a year.

The thieves managed to steal the sticky substance from a warehouse in Saint-Louis-de-Blandford between August 2011 and July of this year. The stolen syrup tops out at $18 million in total market value.

"It's one of the most important robberies in Quebec because of the quantity stolen and the value of the syrup," said Sgt. Gregory Gomez Del Prado of Quebec police.

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