Story highlights Ciudad Acuña, Mexico, is struck by a tornado

At least 13 deaths have been reported

It is the same storm system causing floods in Texas

(CNN) In six seconds, a tornado ripped through the border city of Ciudad Acuña, Mexico, with a ferocity that officials said hasn't been witnessed in more than 100 years.

At least 13 people were killed, including three children, Acuña Mayor Evaristo Lenin Perez said. Another 200 were injured.

Photos from the scene, which sits right across the border from Del Rio, Texas, showed cars blown upright, front bumper on the ground and leaning against homes. The twister flipped over school buses and damaged about 400 homes.

Officials said records don't show such a powerful tornado hitting the city in more than a century.

The storm system that spawned the deadly tornado is the same one whose rains have caused flooding in Central Texas.

Read More