Police found a "viable" explosive device at a Long Island Home Depot on Monday afternoon, a law enforcement source told Fox News.

Management evacuated the store on Tuesday when an employee found the device, which was accompanied by a note demanding $2 million or else more bombs would be placed in stores on Black Friday, a source said.

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Cops put the device into a containment device and detonated it, a source said. Suffolk County Police confirmed that cops "rendered it safe." Police then sent the remnants to the FBI for analysis.

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Home Depot issued a statement saying: "[W]e are cooperating with authorities on their investigation. The safety of our customers and associates is certainly of the utmost importance to us."

Investigators are checking if a disgruntled former employee might be involved.

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