(CNN) -- The rebel battalions and commanders battling Syrian President Bashar al-Assad's regime are signing a "code of conduct" pledging to refrain from torture and other human rights abuses, an opposition group said Wednesday. More than two dozen Free Syrian Army officials have signed the documents, just days after an uproar over reports that a unit called the Tawheed brigade claimed responsibility for executing pro-regime members of the Berri clan in Aleppo, the opposition Local Coordination Committees of Syria said. Rafif Jouejati, the LCC English-language spokeswoman, said some of the content in the code had been in development for months by human rights experts and the LCC and FSA. But the work was accelerated in the wake of the executions last week, she said.
@highlight
NEW: LCC, FSA and human rights experts had been working for months on a code
@highlight
NEW: The effort was accelerated after last week's reports of executions
@highlight
Nearly 30 commanders and battalions signed the pledge
@highlight
The fighters vow to shun looting, sectarian violence, torture and public executions
The @placeholder said "these ethics and principles represent the essence of our revolution and its moral and national foundation."