OKLAHOMA CITY (AP) — The death toll has risen to six from winter storms in the nation’s midsection.

Two passengers in a car on a sleet-slickened Arkansas highway died Wednesday when the vehicle crossed the center line and struck an SUV head-on.

In Oklahoma, the Highway Patrol said a 76-year-old Wisconsin woman died Tuesday. She was a passenger in a car that was hit head-on when a pickup truck crossed into oncoming traffic on Interstate 44.

The Highway Patrol had earlier reported that a 28-year-old woman was killed in a crash on a snowy highway near Fairview, Okla.

The storm’s winds were also blamed Tuesday for toppling a tree onto a pickup truck in Texas, killing the driver, and another tree onto a house in Louisiana, killing a man there.