The nine young people arrested after the death of Thomas, 16, who was fatally injured during a village dance party in France's southwestern Drome region, are still being held in police custody and investigators are working to find other suspects, according to the Valence public prosecutor's office. 'We have to be extremely cautious,' says Guillaume Fort, a lawyer representing four of the suspects after a hearing in Romans-sur-Isère. 'The investigation and the courts will reveal the truth about what transpired that night.' IMAGES AND SOUNDBITES (COMPLETES VIDI344E86M_EN + VIDI344C3Y4_EN + VIDI344E9QN_EN)