The self pro-claimed Islamic State in Iraq and al-Sham (ISIS) has executed and crucified eight men near the northern Syrian city of Aleppo, a pro-opposition group reported Sunday. The Syrian Observatory for Human Rights said the victims were executed Saturday in the town of Deir Hafir because they had fought for rival rebel groups. Rival fighters Sunday fired shells at the ISIS-controlled village of al-Masoudia in north-eastern Aleppo, said the observatory. Elsewhere, ISIS militants were engaged in fierce clashes against opposition and secular rivals in Aleppo's village of al-Jadida near the Syrian border with Turkey.