The first contingent of Free Syrian Army members trained by the United States to fight the Islamic State crossed the border from the training facility in Jordan back into Syria this week, according to a U.S. official familiar with the program.

Unverified pictures on social media showed a convoy of new-looking Toyota pickups carrying American-made heavy machine guns and spare fuel cans headed back into the war-torn country.

The fighters, numbering about several dozen, are a part of the FSA’s 30thDivision, according to the U.S. official, who spoke on the condition of anonymity because he was not authorized to discuss the training publicly. […]