According to media reports, the incident took place in the Syrian city of Azaz in the province of Aleppo that is located on the border with Turkey.
However, Al-Masdar News report suggested that the attack targeted not al-Nusra Front, but Jabhat al-Shamiyah (Levant Front) group's headquaters. The group's Aleppo branch joined Ahrar al-Sham rebel group earlier this year. The Levant Front's membership includes the major Sunni Islamist groups operating in north Syria.
Media report suggested that there are killed and injured Islamist militants as a result of the explosion supposedly carried out by Daesh terrorist group.
Later in the day, the Al-Masdar media outlet reported that the attack killed at least nine people and wounded 11 others.
Azaz is currently under control of Jabhat al Shamiyah, an affiliate of the Free Syrian Army largely supported by Turkey and an ally of Ahrar al-Sham, which according to the Russian Defense Ministry, was among the opposition groups, that agreed to join the Syrian nationwide ceasefire between the Syrian government and opposition factions on December 30.
In early-January 2016, Iranian news agency FARS reported that Daesh attacked al-Nusra Front positions in the province of Daraa, having killed a dozen militants.
Despite the fact that Daesh and al-Nusra Front (which now calls itself Jabhat Fatah al Sham after a "rebranding") fight against the Syrian government and some moderate Syrian rebel groups and also both originated as al-Qaeda-affiliated groups, sometimes their interests clash over gaining control over territories and resources in Syria.