Weather forecasters described the storms as "large and extremely dangerous." The twisters picked up large trucks and slammed them to the ground. They also tore through residential neighborhoods, demolishing homes, smashing cars, and uprooting trees.
American Airlines canceled all flights from the Dallas-Forth Worth Airport until Wednesday. Airline officials say they must inspect more than 100 planes for damage from hail.
Authorities report more than 12 injuries so far, including some severe.
