FARGO, N.D. — Iowa-based Casey’s General Stores Inc. is buying the chain of Stop-n-Go convenience stores in the Upper Midwest.

Casey’s did not disclose the purchase price for the 20 stores in North Dakota and four in Minnesota. The deal is expected to close in May.

“They are a well-managed and established group of stores in a relatively new market area for Casey’s,” President and CEO Robert Myers said in a statement.

Casey’s, based in Ankeny, Iowa, has nearly 1,800 stores in 14 states.

“We hope this acquisition serves as a springboard for more Casey’s locations in the area as we continue to look for opportunities to build and buy stores in the Upper Midwest,” Myers said.