The flesh-eating livestock pest New World screwworm has advanced closer to the U.S. border with Mexico, the U.S. Department of Agriculture said, prompting Washington to block imports of Mexican cattle just days after it allowed them to resume at a port of entry in Arizona.

The latest case of new world screwworm was identified in Veracruz, around 370 miles south of the US-Mexico border.

MEXICO CITY -- Mexico and the United States said they would gradually reopen the United States border to cattle imports from Mexico in July after U.S. agriculture officials suspended them in May over fears of the northward spread of the screwworm, agriculture officials in both countries said Monday.