At least three people have died as severe thunderstorms batter the Southeast and East Coast on Sunday after deadly tornado-spawning storms tore through Texas and Mississippi, ripping off roofs and flattening homes.

A tornado that touched down in Brazoria County, Texas, struck some homes and other structures on Saturday, the authorities said. It was a day of tornado warnings in Texas, Louisiana and Mississippi.

At least two died as a severe weather system continued to move east, threatening to whip up tornadoes in parts of the U.S. Southeast.