PARIS - French prosecutors have opened a preliminary investigation into new allegations of sexual abuse against French troops based in Central African Republic, a judiciary source said on Tuesday. The prosecutors’ office said the probe was opened after the UN passed on allegations of sexual abuse involving French troops that took place in the eastern town of Dekoa between 2013 and 2015. The UN did not give details on number of the alleged victims, their ages, or the number of soldiers involved, the source said.