Meat recalled a month ago that could be contaminated with E. coli was found in seven northern New Jersey stores, state consumer safety officials said Tuesday.

Inspectors in the past week have seized 138 boxes of frozen hamburgers made by Topps Meat Co., which issued a nationwide recall on Sept. 29 for 21.7 million pounds of frozen patties.

Four of the stores, all in Jersey City, were located after a distributor was subpoenaed by the state Division of Consumer Affairs and provided shop names and locations. Inspectors found the other three while visiting nearly 200 stores in Hudson County

State authorities have not determined when the meat was delivered to the stores.