A severe storm system that swept across parts of Texas over the weekend brought numerous reports of tornadoes, damage to buildings, large hail and several inches of rain, the National Weather Service said Monday.

The weather service's Forth Worth office said it had received reports of twisters in rural Johnson and Hill counties but hadn't yet confirmed them.

Some homes and other buildings were flattened in the aftermath of the storm Sunday while other structures had their roofs torn away or were damaged by falling trees. There were no accounts of injuries.

Hail described as the size of ping pong balls, and larger, showered the area.

National Weather Service forecaster Lamont Bain said Monday that severe weather reached Comanche, Erath, Somervell, Bosque, Hill and Johnson counties. He said Glen Rose received more than 4 inches of rain.

Part of the Waxahachie police headquarters south of Dallas flooded as water several inches deep rushed into the building.

Anita Foster, spokeswoman for the American Red Cross, said in a statement Monday that her agency is assessing the damage and providing assistance to families.

"Overnight, Red Cross teams provided cots and blankets for the shelter set up in Maypearl, and stood by for shelter needs in Johnson, Hood and Erath counties," she said. "The event is still unfolding with flash flooding throughout the area."

More severe weather was forecast for North and East Texas through Monday, with forecasts calling for winds up to 70 mph, hail and the possibility of tornadoes.

Other parts of Texas, meanwhile, were lashed by heavy rains. The weather service on Monday issued a flash-flood watch for parts of the Panhandle. Amarillo had received up to 2 inches of rain as of Monday morning, and moderate to heavy rainfall was forecast through the day.

Strong thunderstorms in the Houston area Monday downed trees and damaged homes and buildings.

The Texas Department of Transportation reported heavy rains have led to standing water on roads in Alto and other parts of East Texas, and in Hardeman County, northwest of Wichita Falls near the Panhandle.