FORT POLK — Army officials are now acknowledging they've investigated reports of child-on-child sexual assaults at Fort Polk.

The disclosure comes amid an Associated Press investigation that found many sexual assault reports among children at U.S. military bases where service member families live have languished in a dead zone of justice, in which victims and offenders go without help.

New documents released to AP show Army criminal investigators opened at least four cases at the western Louisiana base, concluding three were true.

Initially, Army's Criminal Investigation Command released a list of 223 sexual assaults among juveniles that showed none at major installations, including Fort Polk.

After reporters challenged the list's accuracy, the agency added 86 cases.

It declines to share the number of reports it says are still being investigated.