NEW : British military releases news of airstrike in Syria , says it hit an ISIS compound . Airstrikes hit near Ayn al - Arab , the site of fighting between ISIS and Syrian Kurdish forces . London - based monitoring station says other airstrikes kill six people near al - Hasakah . Al - Qaeda leader in Syria denounces Muslim countries involved in airstrikes .
NEW : U.S. military releases video of airstrike in Syria , says it hit an ISIS compound . Airstrikes hit near Ayn al-Arab , the site of fighting between ISIS and Syrian Kurdish forces . London-based monitoring group says other airstrikes kill six civilians near al-Hasakah . Al-Qaeda group in Syria denounces Muslim countries participating in airstrikes .