Crews began draining a pond next to a smashed mobile home park in a search for bodies Monday after a twister ripped through Indiana and Kentucky and killed at least 22 people.

About 200 people feared missing from the Eastbrook Mobile Home Park in Evansville had been accounted for by Monday night, police said.

Authorities said Sunday that 18 people died at the park in Vanderburgh County. They said at least four others were killed in neighboring Warrick County, although the local coroner had said on Sunday there were five confirmed deaths there.

After turning over debris in the mobile home park and listening for signs of life in the ruins, searchers turned their attention to the drainage pond, where several bodies had been found.

State officials said nearly 600 houses in the two Indiana counties were destroyed or heavily damaged. Gov. Mitchell E. Daniels Jr. (R) declared a state of emergency and asked for federal disaster assistance.

Rick Kalishun spent the day at a hospital where son Trystan, 4, was recovering from a punctured lung suffered when the tornado hit their mobile home.

After the tornado hit, "I was sitting on the couch looking at the sky," Kalishun said. "I saw the 60-inch TV from the front of the living room -- it ended up on the recliner, just like someone laid it there screen faceup."

The tornado's potency, its 20-mile path of destruction and the fact that it struck in the middle of the night were all unusual, said Dan McCarthy, the warning coordinator at the federal government's Storm Prediction Center in Norman, Okla.

Although most people think of tornadoes as a spring event, McCarthy said, the nation experiences a "second season" of tornadoes from mid-October through November, when weather conditions resemble those in the spring.

"That's what makes tornadoes so dangerous this time of the year -- people just don't expect them. They expect them to happen in the spring . . . not at 2 in the morning in November," he said.

Indiana officials said emergency sirens sounded twice, but many in the mobile home park said they did not hear them.

Pieces of the grandstand lie on the racetrack at Ellis Park after a tornado tore through Henderson, Ky. The tornado, which also hit southern Indiana, killed at least 22 people and destroyed nearly 600 houses in two Indiana counties.