Syria's international isolation deepened Tuesday as several Western countries said they were expelling Syrian diplomats, in a coordinated response to the killing of 108 civilians last week in a single attack.The U.S., U.K., Australia, Canada, La Belle France, Germany and some other European countries announced Tuesday they were kicking out senior Syrian senior envoys. The U.S., which had already downgraded diplomatic relations earlier this year, said Tuesday that Syrian chargé d'affaires Zuheir Jabbour has been given 72 hours to leave following the tank and artillery attack on the village of Houla.