11:20 p.m.

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.

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10:20 p.m.

A fire official in North Texas says there is "significant damage" to homes and an unknown number of injuries after severe weather hit the small city of Van.

The National Weather Service received a report of a tornado near Van, in Van Zandt County, as severe thunderstorms passed through Sunday night.

Van Fire Chief Jeff Hudgens says the city sustained "some significant damage" to "multiple homes" and says agencies are responding to confirmed injuries. He did not have any further details on the number of people hurt or the extent of their injuries. There were no immediate reports of fatalities.

No further details were immediately available.

A severe thunderstorm warning is in effect for Van Zandt and Henderson counties until 11 p.m.

Van is about 70 miles southeast of Dallas.

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6 p.m.

Authorities made dramatic rescues of some people in the town of Krum, Texas, who were stranded by flash floods after torrential rains.

Denton County Emergency Services Chief Jody Gonzalez said Sunday that multiple rescues had been performed from flooded streets and homes in the small town located about 50 miles northwest of Dallas.

National Weather Service meteorologist Matt Staley said there were numerous road closures in North Texas after storms dumped six to seven inches of rain on some places over the last four days.

Television images showed some vehicles nearly submerged.

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5:05 p.m.

South Dakota Gov. Dennis Daugaard says the number of people injured in the tornado in Delmont has risen to nine and none of the injuries are life threatening. Seven of the nine people hurt have been released from the hospital. Daugaard spoke as he toured tornado damage in the tiny South Dakota town.

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4:50 p.m.

Authorities say eight people are hurt after a tornado struck the small South Dakota town of Delmont, but none of the injuries is life-threatening.

Douglas County State's Attorney Craig Parkhurst says the injured were taken to hospitals. Three people taken to a hospital in Parkston already have been treated and released.

The tornado struck the town of about 200 people around 10:45 a.m. Sunday.

About 20 buildings are damaged, including Zion Lutheran Church, which lost its roof and stained glass windows. Children who were in Sunday school took shelter in the basement when the tornado hit.

Gov. Dennis Daugaard is in Delmont to tour tornado damage. Residents are being asked to leave town for safety reasons.

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4:30 p.m.

The National Weather Service says the threat of tornadoes has moved north from Texas to southeastern Oklahoma, where a tornado warning has been issued for part of Bryan County.

The major hazards are strong winds, golf-ball size hail and the possibility of a tornado. Forecasters say flying debris could dangerous to anyone caught without shelter. Mobile homes could be damaged or destroyed and damage to roofs, windows and vehicles is possible.

Much of central and eastern Oklahoma remains under a tornado watch until 9 p.m.

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4:05 p.m.

Denton County Emergency Services Chief Jody Gonzalez says a likely tornado caused limited damage near the North Texas town of Denton.

Gonzalez says the storm moved through the area so fast Sunday afternoon that it caused "very limited damage," such as signs blown over and some trees damaged. Television footage showed portions of some industrial roofs ripped off.

National Weather Service meteorologist Tom Bradshaw says they believe a tornado touched down near the town located about 40 miles northwest of Dallas.

Gonzalez says that as the rains continue, they've performed multiple water rescues from streets and homes in the nearby town of Krum.

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3:25 p.m.

The National Weather Service says a likely tornado caused damage near the North Texas town of Denton.

Meteorologist Tom Bradshaw says the NWS believes a tornado touched down Sunday afternoon near Denton, which is about 40 miles northwest of Dallas.

Bradshaw says roofs were ripped off of buildings and trees were damaged.

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2:50 p.m.

South Dakota Department of Public Safety spokeswoman Kristi Turman says residents of Delmont being asked to leave for safety reasons.

Turman says about 20 buildings are damaged and the town has no water, power or phones. She says there are unsecured propane tanks.

The tornado flattened a home near the entrance to Delmont. About three-dozen people were helping the homeowner, who would not talk to an Associated Press reporter.

Across the street, 87-year-old Walter Stoebner said his house was damaged.

"It sucked the window out of the living room, frame and everything," Stoebner said. "It was just one big bang, and that was it. It didn't last long."

Some cow carcasses were piled up near a farm in Delmont, having either died in the tornado or hurt and later euthanized.

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1:30 p.m.

The National Weather Service has issued tornado watches in several Midwest and Great Plains states through Sunday evening.

Watches have been issued for central and North Texas, central Oklahoma, western Arkansas, western Iowa, eastern Nebraska, central Missouri and parts of Minnesota and South Dakota.

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1:25 p.m.

A spokeswoman for a South Dakota hospital says that three people who were injured in the Delmont tornado are in good condition at Avera St. Benedict Health Center in Parkston.

Avera spokeswoman Lindsey Meyers said all three people either drove themselves or were driven.

It wasn't known how many more people were injured in the tornado, which hit about 10:45 a.m. Sunday.

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12:35 p.m.

Delmont fire chief Elmer Goehring says there "have been some injuries" from the tornado in Delmont, South Dakota, but told The Associated Press that he was too busy to provide details.

Delmont resident Anita Mathews says a Lutheran church and the city's new fire hall were both heavily damaged in the tornado, which hit about 10:45 a.m. Sunday.

Mathews also says power is out in the town, which is about 90 miles southwest of Sioux Falls.

No deaths have been reported.

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12:15 p.m.

South Dakota Department of Public Safety spokesman Tony Mangan says there have been no reports of injuries after a tornado hit the small town of Delmont.

Mangan said local authorities asked for help from the South Dakota Office of Emergency Management.

The National Weather Service said a tornado hit Delmont about 10:45 a.m. Sunday. No deaths have been reported.

Delmont is about 90 miles southwest of Sioux Falls, South Dakota.

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11:15 a.m.

The National Weather Service has received reports of a tornado hitting a small southern South Dakota town.

Meteorologist Philip Schumacher at the service's Sioux Falls office says law enforcement officials said a tornado hit Delmont about 10:45 a.m. Sunday.

Delmont has about 200 residents and is about 90 miles southwest of Sioux Falls.

Schumacher said no deaths have been reported and it wasn't known whether there were injuries. He said a couple buildings have been damaged.

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11 a.m.

The National Weather Service has issued tornado watches in several Midwest and Great Plains states, running until 9 p.m. Sunday in many places.

Watches have been issued for north and central Texas, eastern Oklahoma, western Arkansas, western Iowa, eastern Nebraska and parts of Minnesota and South Dakota.