The U.S. on Wednesday launched its first airstrikes by Turkey-based F-16 fighter jets against Islamic State targets in Syria, marking a limited escalation of a yearlong air campaign that critics have called excessively cautious.

In a brief statement the Pentagon announced the F-16 strikes were launched from Incirlik Air Base in southern Turkey but provided no details on the number or types of targets struck.

A U.S. defense official said later that two of the six F-16s based at Incirlik flew the mission over Syria to hit one or more targets that had been selected in advance. The official spoke on condition of anonymity to discuss details of the mission. […]