First responders sift through wreckage of a home Thursday in Granbury, Texas. Several tornadoes struck the area overnight, killing at least six. The Dallas Morning News/Associated Press

GRANBURY, Texas—Emergency officials searched a shattered neighborhood for victims here Thursday after tornadoes struck the previous evening, killing at least six people, injuring several dozen others and damaging about 100 homes.

Seven people remained unaccounted for Thursday here in Granbury, a town of about 8,000 people 40 miles southwest of Fort Worth, as emergency workers continued to comb through the hard-hit Rancho Brazos neighborhood, said Hood County Sheriff Roger Deeds. He said the search would continue until all were found.

While parts of Granbury appeared intact, with white fences still standing and wildflowers covering fields, others had been churned by the storm. All that was left of several homes were their concrete slabs or floors.

At least six people were killed and multiple homes were destroyed Wednesday evening after tornadoes struck Granbury, Texas. Photo: AP

"How do you take cover from that?" asked Steve Berry, a Hood County commissioner. "There's nothing left. This tornado was a monster." Mr. Berry said he didn't have a full picture of injuries but understood that many people had suffered broken bones.

He said the affected neighborhood, home to many Hispanic residents, included more than 60 houses built by the group Habitat for Humanity.

Habitat for Humanity house number 66, a new four-bedroom, two-bathroom home that had yet to be occupied, was among the buildings blown away by the storm. It was supposed to be dedicated Saturday, with a single mother of five moving in, said Michelle Kennedy, a Habitat for Humanity staffer who was helping with the tornado response.

"It's devastating," said Alan Sloan, a volunteer who helped build the home.

Jessica Ozuna and her family were about to have dinner Wednesday evening when baseball-sized hail started dropping. From their doorway, they saw a massive funnel form just blocks away from their house.

Huddled under a mattress in their hallway, they prayed the tornado would not pull the roof off and suck them away, said Ms. Ozuna, a 36-year-old hairdresser.

"It was terrifying," Ms. Ozuna said. "It was like having jet engines in your house."

A piece of lumber from another house pierced the roof. But the house was still standing when Ms. Ozuna came out, and her three dogs and cat, which endured the storm outside, survived. A few doors away, some houses were leveled.

"That's when you know you're blessed," Ms. Ozuna's daughter, Isabel, said Thursday afternoon, still in the pajamas that she was wearing when she evacuated the night before.

As many as three tornadoes struck Granbury, part of a larger storm system that affected other parts of North Texas, including the Dallas-Fort Worth metropolitan area. All told, an estimated 10 tornadoes hit the region, said Mark Wiley, an emergency-response meteorologist with the National Weather Service.

The biggest tornado that struck Granbury was a Category 4, with estimated winds of 160 to 175 miles per hour, Mr. Wiley said, adding that only about 10 to 12 storms reach that level of severity in the U.S. each year.

The estimated 10 tornadoes in North Texas was "a big number for a small area," Mr. Wiley said.

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