Seven adults were killed early Sunday near Elk City, Okla., when the minivan they were in hit a slick spot on I-40, crossed the median and hit a semitrailer truck, the Oklahoma Highway Patrol reported.

Missouri Gov. Matt Blunt said about 300,000 households there remained without power on Sunday. About 350 National Guardsmen were going door to door checking on residents in the hardest-hit areas and were helping to clear slick roads of tree limbs and power lines.

"We have what appears to be a three-wave storm," he said. "We're in the final wave of it."

About 111,000 customers lacked power in Oklahoma, utilities reported. In Texas, 415 flights were canceled Sunday at Dallas-Fort Worth International Airport.

In Nebraska, which has been pummeled by winter storms over the past month, the weekend storm dropped even more snow, making roads treacherous.

As the storm began to fade from the nation's midsection, parts of the East began to suffer.

In Albany, N.Y., a 22-year-old man fell about 90 feet from a bridge to a road below after climbing a railing to avoid being hit by a sliding car. He had gotten out of his vehicle about 2 a.m. after a crash.

In Syracuse, N.Y., I-81 was closed for about two hours after about 30 cars were involved in six accidents early Sunday. Several people were taken to hospitals.

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