Thousands of residents in the Dallas area are reportedly without power after a tornado hit Sunday night.

Power company Oncor reported “significant damage to power lines.” The company confirmed to CNN that more than 100,000 customers in the Dallas/Fort Worth area were without power on Monday morning.

The city of Dallas said there had been no reports of deaths or serious injuries, according to The Dallas Morning News.

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The newspaper reports that the National Weather Service began surveying damage at 7:30 a.m., and the investigation could stretch into a second day.

Early estimates suggest wind speeds were well over 100 mph, the Morning News added. ADVERTISEMENT

A number of Dallas schools and campuses were closed on Monday as a result of damage, the city said on Twitter.

Weather threats continued on Monday, as the National Weather Service issued a tornado watch for parts of Arkansas, Louisiana, Oklahoma and Texas until 10 a.m. local time.