Trial to Start in Forced Grand Canyon Hikes A federal trial is set to begin Wednesday for an Indiana man accused of forcing his grandsons to hike for miles in the Grand Canyon without food or water in brutal August heat. Christopher Alan Carlson of Indianapolis has pleaded not guilty to six counts of child abuse. His grandsons, who were 12, 9 and 8 years old at the time, told investigators that Carlson hit, pushed, choked, and squeezed them, and forced their fingers down their throats to make them vomit during trips into the Grand Canyon. A ranger with binoculars spotted the group on what would be the last of the hikes on Aug. 28, when the temperature soared to 108 degrees and a man died on another trail from heat exposure. The ranger reported seeing Carlson shoving the oldest boy and whipping him with a rolled-up T-shirt. FILE -- A 2006 file photo provided by the Indianapolis Metro Police Dept, shows Christopher Carlson, Carlson is accused of forcing his young grandsons for miles along a sun-baked Grand Canyon hiking trail and denied them water and food. (AP Photo/Indianapolis Metro Police Dept, file) Close Rangers fed the boys and gave them water after one showed symptoms of heat stroke and the other two had signs of heat exhaustion and dehydration, authorities said. The boys were placed in the care of state Child Protective Services. Investigators say Carlson told them that the boys were overweight and that he thought hiking the Grand Canyon would help get them into shape. "He told me that he loved his grandchildren very much, but at the same time there were tough people in the world and his grandchildren needed to be tough as well," National Park Service Special Agent Chris Smith said at the time. Defense attorneys have questioned the boys' statements, saying it seemed improbable that they could have gone on such a hike without food and water. The boys' mother, Tara Danaher of Indianapolis, sobbed at a court hearing Sept. 1 and said her children went on trips with Carlson over the summer, including to Central America and Jamaica. She said she talked with her children throughout the summer and they never expressed any concerns. The highlight of the latest trip that included the Grand Canyon was supposed to be Disneyland, she said. Follow Amanda Lee Myers on Twitter at https://twitter.com/#!/AmandaLeeAP