Law enforcement authorities have arrested a Home Depot employee in connection with a pipe bomb left at one of the store's locations on Long Island last month.

The crude pipe bomb was left at the store on New York Avenue in Huntington in what police say was an extortion attempt. A letter was also mailed there demanding $1 million and describing where the pipe bomb was inside the building. 

The letter had been sitting for some time in the store before it was opened. It stated that if the money wasn't paid by Black Friday in November, more devices could be planted.

Sources said the pipe bomb did not have a timer attached to it but if someone had opened the box containing the device, it could have detonated.

Law enforcement sources say the suspect, Daniel Sheehan, is a current Home Depot employee, though the location where he works is not clear.

He was arrested late Wednesday on federal extortion charges and may face additional charges of violating federal explosives statutes.

Lawyer information was not immediately available.

Home Depot said in a statement it was grateful for the work of law enforcement and apologized to customers for any inconvenience.

Mary Galligan, FBI acting director in New York, said Sheehan had “a demonstrated ability to build bombs,” adding the scheme caused “economic loss, was a huge drain on law enforcement resources and threatened the safety of untold numbers of innocent people.”