DES MOINES, Iowa (KPTM) - At least four people were killed and 40 injured Wednesday evening when a tornado struck Little Sioux Boy Scout camp in western Iowa.

KPTM FOX 42 News has learned that four victims have been taken to Creighton Medical Center. Creighton says two boys, 15-year-old Mason Flora and 13-year-old Kevin Hannah are in stable condition.

Two others are at Creighton, but their names are not being released.

An administrator with Alegent in Missouri Valley says 11 victims were taken there. Three of those victims were then transported to Creighton.

More victims were arriving at Alegent as of 11:45, according to that administrator. FOX 42 reporters on the scene say those victims suffered very minor injuries and were released.

Uninjured scouts were reunited with their parents at Mondamin High School.

A search and rescue team deployed after the 7 p.m. twister had to cut their way through branches during a lightning storm to reach the camp where the 93 boys, ages 13 to 18, and 25 staff members were attending a weeklong leadership training camp.

An Omaha Police Department helicopter pilot tells FOX 42 reporter Julie Hong that a team will fly over the site when the weather clears to do a sweep of the scene with an infared camera, to make sure the area is clear.

The camp is secured by the National Guard and local police.

"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 says. "You've got 1,800 acres of property that are destroyed right now."

He said they were staying in tents and that the site is destroyed.

"All of the buildings are gone; most of the tents are gone; most of the trees are destroyed," Roitstein said. "You've got 1,800 acres of property that are destroyed right now."

"We had fire trucks and rescue units backed up two miles down the road away from this location," said Russ Lawrenson with the Mondamin, Iowa, Fire Department, who was on the scene shortly after the storm hit.

Gayle Jessen of Fremont, Neb., said her 19-year-old son Zach is a staff leader at the camp. He called his parents to say he had a bruise on an arm and was being treated at a hospital.

"I'm so relieved my son is OK," Jessen said. She said her husband was headed to the hospital to pick up their son.

Lewrenson said parents will be reunited with their children at an undisclosed location.

David Hunt, chairman of the Mid-America Boy Scout Council's Goldenrod District, which covers several eastern Nebraska counties, said he believed the boys were from eastern Nebraska and western Iowa.

The tornado touched down as Iowa's eastern half grappled with flooding in several of its major cities. The storm threatened to stretch Iowa's emergency response teams even further.

Officials at Burgess Memorial Hospital, about 20 miles from the ranch, said they had treated several patients injured by the storm Wednesday night and that injuries ranged from minor to serious.

A spokesman for Mercy Medical Center in Sioux City said two children had arrived at the hospital by helicopter.

"These are traumatic injuries," said spokesman Mike Krysl, who said the regional trauma center is "in disaster mode."

The twister struck as Iowa, like other Midwestern states, was dealing with severe flooding along the upper Mississippi River.

Heavy downpours hit the region over the weekend, with more thunderstorms predicted for Wednesday night and Thursday morning.