From ABC News Online: Children held at Camp Xray, US admits:

The commander of the joint task force at Guantanamo, Major General Geoffrey Miller, says more than one child under the age of 16 is at the detention centre. [...] The children are still being interrogated and will continue to be held at Guantanamo.

Call your congresspeople and demand an investigation!
Congressional Switchboard Number: 1-202-224-3121 or 1-800-839-5276