A first-grader and his brother in kindergarten took two handguns, one of them loaded, on a bus to a Kentucky elementary school Thursday morning after apparently thinking they were toys, authorities said. They said no one was hurt and the firearms were seized when the boys reached school.

The boys, ages 6 and 7, had a gun each in their school backpacks and showed them to some other pupils on a bus headed to Dewitt Elementary School in Flat Lick, said Kentucky State Police Trooper Shane Jacobs. He said one student alerted a teacher and the eastern Kentucky school was briefly locked down and the guns were confiscated.

"We never felt that the kids' intent was to hurt anyone at the school," Jacobs said by phone. "We feel the kids didn't know that they were actually a firearm. They thought they were toy guns."

Each boy, however, has been charged with possession of a firearm on school property, Jacobs said. "Due to the seriousness of a firearm being brought to a school, state police felt like charges had to be filed," he told The Associated Press.

Investigators were trying to determine how the boys obtained the handguns, he said.

The boys, who aren't being identified, were interviewed by investigators but didn't understand the seriousness of the incident, Jacobs said. "They don't even know what's happening," he said. "They're little bitty."

He expected that the boys would to be turned over to their family.

In a letter to the parents of children at the school, Knox County schools Superintendent Kelly Sprinkles said the school staff acted quickly once they were alerted.

"At no time do we feel that students were in danger, Sprinkles said. "This was a violation of state law; therefore the students involved will be subject to school board policy and appropriate laws that govern weapons on school property."

The superintendent urged parents to discuss the incident with their children, to check their kids' backpacks regularly and to emphasize that it's illegal to bring weapons to school.