US-led air strikes killed seven militants from the Al Qaeda-affiliated Nusra Front in the northwest of Syria on Wednesday, a monitoring group said.
The Nusra is one of the most prominent Syrian opposition factions on the ground, battling Syrian President Bashar al Assad and his forces.
"Seven Al Nusra members, including commanders, were killed in at least five coalition air strikes against the group's bases and a vehicle in Idlib province," said Rami Abdel Rahman, head of the Syrian Observatory for Human Rights.
The UK-based group couldn’t specify if there were commanders among those killed.
The Nusra and allied Fateh Army took control of Idlib province earlier this year after a lightning advance.
The United States listed the Nusra as a “terrorist organisation” in December 2012.
More than 220,000 people have been killed since the civil war broke out in Syria in 2011.
Around 6,7 million Syrians - 70 percent of the population - are displaced internally while at least 5 million people have fled the country to neighbouring Turkey, Iraq, Lebanon and Jordan.