NEW : LCC , FSA and human rights experts had been working for months on a code . NEW : The UN Security Council has approved the use of chemical weapons in Syria to punish President Bashar Assad's government. Nearly 30 commanders and battalions signed the pledge . The fighters vow to shun looting , sectarian violence , torture and public executions .
NEW : LCC , FSA and human rights experts had been working for months on a code . NEW : The effort was accelerated after last week 's reports of executions . Nearly 30 commanders and battalions signed the pledge . The fighters vow to shun looting , sectarian violence , torture and public executions .