Blencoe, Iowa ? A tornado slammed a Boy Scout camp in the remote hills of western Iowa on Wednesday, killing at least four people and injuring 40, most of whom were on a hike when the twister struck.

All of the children had been accounted for late Wednesday, after rescuers cut their way through downed trees and debris to reach them, said Russ Lewrenson of the Mondamin Fire Department.

A search and rescue team had been deployed to the camp near Little Sioux, Iowa Homeland Security spokeswoman Julie Tack said.

At least 40 people who were injured in the storm were being taken to area hospitals. Most of the kids who were hurt were out on a hike when the tornado hit, Lewrenson said.

There were 93 campers, ages 13 to 18, and 25 staff members at the leadership training camp, Tack said.

The ranch about 40 miles north of Omaha, Neb., includes hiking trails through narrow valleys and over steep hills, a 15-acre lake and a rifle range.

“All of the buildings are gone; most of the tents are gone; most of the trees are destroyed,” Lloyd Roitstein, president of the Boy Scouts of Mid-America Council, told CNN.