A 13-year-old boy who was part of group taken into custody at a squalid New Mexico compound last month has told FBI agents his mother's boyfriend was training him to conduct "jihad" against nonbelievers, according to federal court documents.

The boy was among 11 children and five adults living at the compound in Taos County when it was raided on Aug. 3 by local sheriff's deputies who discovered a cache of firearms and the children living without food or clean water. The dead body of a three-year-old boy was found buried at the site later.

They initially faced state charges, then on Friday, the five adults including a Haitian woman described as the group's leader, 35-year-old Jany Leveille, were arrested by the Federal Bureau of Investigation and accused of conspiracy and firearms offenses.