At least 10 adults are unaccounted for after a possible tornado hit the East Texas town of Van, injuring more than two dozen people.

Van Zandt County Fire Marshal Chuck Allen said Monday that 26 people were transported to hospitals by emergency personnel. Allen says an unknown number of others went by private vehicle for care after Sunday night's storm.

He had no further details on the 10 missing people in Van, a town of about 2,600 located 70 miles southeast of Dallas.

Allen says 30 percent of Van has damage and about 50 people were in a shelter at a church.

The National Weather Service believes at least one tornado hit Van, with damage to be surveyed Monday.

Oncor (ON'-kor) reported nearly 11,000 customers without electricity Monday, including the Van area.

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Officials say two groups of people in North Texas had to be rescued by helicopters after rising floodwaters left them stranded.

Denton County Deputy Fire Marshal Marc Dodd says a Texas National Guard helicopter airlifted four adults and one infant on Sunday from the roof of their home near the city of Krum.

Dodd says another helicopter rescued two adults near the city of Sanger from the roof of their pickup truck, which video showed was surrounded by rushing water.

He says 10 others in the county had to evacuate their homes.

National Weather Service meteorologist Matt Staley says some locations in North Texas have gotten from six to seven inches of rain over the past four days.

Officials will be performing damage assessments in the area Monday.