Poland on Thursday urged its citizens to leave Iran at once, after a rapid U.S. military buildup in the Middle East raised the specter of direct confrontation with Tehran. “Please leave Iran immediately and under no circumstances travel to this country,” Poland’s Prime Minister Donald Tusk said in the town of Zielonka near Warsaw on Thursday. “I do not want to alarm anyone, but we all know what I am referring to. The possibility of a conflict is very real.” The prime minister warned that the