BAGHDAD (Reuters) – The United States plans to “go after” what it said were networks of Iranian and Syrian agents in Iraq, U.S. ambassador Zalmay Khalilzad said on Monday. “We’re going after their networks in Iraq,” he told a news conference, as he laid out the new U.S. and Iraqi strategy to end sectarian violence at what Khalilzad called a “defining moment” for Iraq. U.S. forces are holding five Iranians following a raid on an Iranian government office in Arbil last week — the second such operation in recent weeks.