The United States on Tuesday warned Turkey against launching a new military operation in northern Syria, saying the uneasy NATO ally would be putting US troops at risk. Turkish President Recep Tayyip Erdogan said Monday that Turkey would soon launch a new military operation into northern Syria to create a 30-kilometer (19-mile) "security zone" along the border. "We are deeply concerned about reports and discussions of potential increased military activity in northern Syria and, in particular, its impact on the civilian population," State Department spokesman Ned Price told reporters. "We condemn any escalation. We support maintenance of the current cease-fire...