The US-led coalition against the Islamic State group hit a weapons depot belonging to a rebel group allied with Al-Qaeda's Syrian affiliate overnight in northwestern Syria, a monitor said today.
The strikes killed 10 members of the Jaish al-Sunna group, as well as a child, the Syrian Observatory for Human Rights said.
The raid hit the Atmeh region of Idlib province, home to a large camp for displaced Syrians, but did not strike the camp itself, Observatory director Rami Abdel Rahman said.
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Jaish al-Sunna belongs to the Army of Conquest alliance that has captured much of Idlib province from the Syrian government in recent months.
The Army of Conquest alliance includes Al-Nusra Front, which is Al-Qaeda's Syrian affiliate, as well as other Islamist rebel forces.
The US-led coalition fighting IS began strikes in Syria last September and has rarely expanded its targets beyond the jihadist group.
It has on occasion hit positions belonging to Al-Nusra, though Washington has identified those strikes as hitting what it calls the Khorasan group, which is says is a cell of senior Al-Qaeda leaders.
Early on in the air campaign, strikes also hit Ahrar al-Sham, another Islamist rebel group that is part of the Army of Conquest alliance.