At least 13 people have died in the southern United States, authorities say, after powerful tornadoes hit the Texas, Oklahoma and Arkansas during the night from Saturday to Sunday.

Rescuers were still searching today to try to find survivors under the rubble of buildings hit by the extreme weather, which also caused widespread power outages.

The US National Weather Service (NWS) counted a total of 25 tornadoes yesterday Saturday.

North of Dallas, Texas, a tornado killed at least five people, according to Cook County Sheriff Ray Sappington, including two children ages 2 and 5. He added that the number of victims is expected to rise.

“Unfortunately, the death toll will rise,” he predicted on The Weather Channel, citing “enormous damage.”

A section of highway was severely damaged by the storm, while dozens of people fled to a gas station for shelter. “Many” people were injured there, Sappington said.

Tornado leveled 3 states in the USA / Photo AP

Two people have died in western Oklahoma after another tornado touched down, officials told a local television station.

In northern Arkansasa powerful storm killed two people early this morning, authorities said.

Bad weather also caused problems at the 108th running of the Indianapolis 500, much further north and east, with organizers of the legendary auto race asking spectators to leave the stands.

Almost 500,000 houses were without electricity this Sunday morning in Texas, Missouri, Oklahoma, Kansas, Tennessee and Arkansas, according to the website poweroutage.us.

Tornado warnings remain in effect today.

Information from APE and BBC