Home Depot customers in Maine and New Hampshire could be among the millions of people who could be at risk after the retailer announced Monday its payment systems suffered a cyber attack, according to the Huffington Post.

The daily online news site reported the data breach that could affect Home Depot customers who used credit and/or debit cards at its more than 2,000 U.S. and Canadian stores could be one of the biggest in history. While Home Depot officials have not said how many customers could be affected, officials said their probe has been ongoing since April.

Have you shopped at Home Depot since April? If so, contact your bank and make sure your data has not been compromised by this cyber attack.