A US contractor was killed Thursday after a suspected Iranian-affiliated drone struck a facility housing US personnel in northeast Syria, the Pentagon said, and the US responded by striking what it said were Iran-affiliated facilities in the country. The infrastructure that was targeted in the US response was not directly related to the suspected Iranian drone itself, the official said, but was instead targeted by the US because it was known to be supporting Iranian proxy groups in the country with munitions and intelligence. Just two days before the rocket attack, four US troops and one working dog were injured in a helicopter raid against a senior ISIS leader in northeast Syria