Director of the Syrian Observatory for Human Rights Rami Abdel Rahman said the death toll could rise as dozens of civilians were also injured in the explosion during Iftar prayers in the city of Ariha.
"Twenty-five members of Al-Nusra Front, including a leader of the terrorist group, died in an explosion inside a mosque in the city of Ariha, in Idlib province," the Britain-based observatory said.
ISIS suicide terrorist attack was the cause of blast.
"Twenty-five members of Al-Nusra Front, including a leader of the terrorist group, died in an explosion inside a mosque in the city of Ariha"
So-called “Syrian Revolution General Commission” said "hundreds of civilians were assembled for an Iftar gathering with the Al-Nusra Front in the Salem mosque in the west of Ariha when the blast went off during evening prayers".
Civilians were also among those killed while worshipping during holy Muslim festival of Ramadan.