At least 13 people have been killed by a category 4 tornado that swept through Ciudad Acuña Monday.
Images from the town, just across the border from Del Rio, Texas, showed cars flipped, buses smashed and hundreds of homes destroyed or damaged.
The tornado reached speeds of up to 186mph and officials say there are fears the death toll could rise.
Across the border from Ciudad Acuña, Texas also saw tornados and heavy rains resulting in massive flooding from the storm system.
Houston received 10 inches of rain during the storm. Many parts of the city are flooded bringing it to a near-standstill Tuesday.