U.S. warplanes launched airstrikes in northwestern Syria near the Turkish border early Thursday, targeting a group other than the Islamic State for only the second time since the air campaign in the country began and threatening to draw Washington deeper into Syria’s multilayered conflicts.

A damaged vehicle parks beside collapsed buildings after what activists said was a U.S.-led air strike on Kafar Joum village in West Aleppo. (Stringer/Reuters)
The U.S. Central Command said five strikes were conducted specifically against the al-Qaeda-linked Khorasan group using manned aircraft and drones. There were unconfirmed reports that a French bombmaker with the group was among those killed.