NEW : Van der Sloot ' n't say where body is , official statement . Van der Sloot is in jail in connection with different case . Attorney says he will try to have confession in Peru ##gia dismissed . Van der S not properly represented during interrogation , lawyer says .
NEW : Van der Sloot wo n't say where body is , official says . Van der Sloot held in Peru in connection with different case . Lawyer says he will try to have confession in Peru slaying dismissed . Van der Sloot not properly represented during interrogation , lawyer says .