Child abuse at Grand Canyon?

PHOENIX (AP) - An Indiana man accused of forcing his grandsons to hike for miles in the Grand Canyon without food or water in brutal August heat went on trial Wednesday, with his 9-year-old grandson testifying that he experienced cramping, nausea and hunger during the miles-long treks.

Prosecutors have alleged that 45-year-old Christopher Alan Carlson of Indianapolis pushed, choked and repeatedly kicked his three grandsons and deprived them of food and water during the hikes on Aug. 15 and Aug. 28, when the temperature soared to 108 degrees.

Carlson put his grandsons - who were 12, 9 and 8 years old at the time - in circumstances "likely to cause death or serious bodily injuries," a criminal complaint said.

The statements from the boy, the youngest of the three brothers, were the first he's made publicly about the charges against his grandfather, who faces six counts of felony child abuse. Carlson has pleaded not guilty in the case and could face life in prison.

Under questioning from prosecutor Camille Bibles, the boy described one instance in which he said Carlson hit him in the face, causing his nose to bleed. He also said that Carlson kicked all three boys on the hike up from the Grand Canyon and would pinch pressure points in their back that "kinda hurt."

The criminal complaint said that one brother feared his older brother would fall to his death because Carlson forced him to walk on the edge of the trail even though he was cramping and falling down. Another brother said that when he fell, Carlson picked him up by the throat and threw him to the ground, and another said Carlson had slammed his face into a rock, the complaint said.

Investigators said the boys were covered in cuts, bruises and scars that backed up their stories. But defense attorney Jeffrey Williams told jurors Wednesday the injuries "are consistent with boys who are just normal boys who had a very active summer."

Investigators have said 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.

Under questioning from Williams, the boy said the kicking didn't hurt much most of the time and that he often gets nosebleeds for no reason. He also said his grandfather was in a hurry on the Aug. 28 hike to get to the top of the Grand Canyon so they could watch the sunset together.

Bibles and Williams painted two vastly different pictures of the hikes in opening statements to the jurors as the trial got under way Wednesday.

Carlson used the Grand Canyon as a weapon in child abuse, Bibles said.

"These hikes became a life or death situation for these children at the hands of the person that was supposed to be protecting them," she said.

Williams portrayed Carlson as an active health nut who had a firm hand and wanted to show the boys the world. Like anyone after a long hike, the boys were tired, hungry and thirsty, but Carlson only allowed the boys to eat healthy food like tofu, hummus and veggie burgers, Williams said.

"I suppose to an 8, 9 or 10-year-old that might seem like child abuse if you like cheeseburgers, French fires and pizza," he said. "He wanted to get them from behind the TV, the games and fast food."

The boy also testified Wednesday that his grandfather took him and his brothers on many "awesome" adventurous trips. In between the two hikes Carlson took the boys on a tour of the Hoover Dam, to rides atop the Stratosphere hotel and a Criss Angel magic show in Las Vegas, and to Disneyland in California.