NEW : Guard who said he witnessed the attack speaks to reporters . Videos released this day purportedly show abuse at a private , juvenile detention facility . The U.N. urges Georgia to investigate all reports of human rights abuses . Georgia 's interim interior minister says torture in the country will be eradicated .
NEW : Guard who says he taped the abuse speaks to CNN . Videos released this week purportedly show abuse at a prison , juvenile detention facility . The U.N. asks Georgia to investigate all allegations of human rights abuses . Georgia 's interim interior minister says torture in the country will be eradicated .