The markets got an unwelcome reminder today that the war in Iran isn’t over, clouding a picture that’s recently been dominated by sunny earnings reports. On Monday, the Dow Jones Industrial Average lost 557 points, or 1.1%, while the S&P 500 declined 0.4% and the Nasdaq Composite slipped 0.2%; the latter two had closed out last week at fresh highs. The war in the Middle East, which Wall Street had all but ignored in recent weeks, flared back into view on Monday.