Four leaders of al-Qaeda's branch in Syria, al-Nusra Front, including its general military commander Abu Humam al-Shami, have been killed in an explosion in the northwest province of Idlib on Thursday, Al Arabiya News Channel reported.
Al-Shami is one of the most senior Nusra Front figures to be killed since it is formed in 2012 and has fought in Afghanistan, Iraq and Syria.
Reports said the explosion was caused by a coalition airstrike that hit a high-level Nusra Front meeting in Idlib, but the coalition has denied having conducted any airstrikes in the province in the past 24 hours.