As the U.S.-led strikes continue, an al-Qaeda-linked group in Syria, the Nusra Front, has vowed for the first time to retaliate against the United States. In a video statement, the group’s leader said: “People of America, Muslims will not stand watching their children bombed and killed and you staying safe in your homes.” The Nusra Front had previously focused its efforts on the ouster of Syrian President Bashar al-Assad.