Armed men entered Baghdad's municipal building during a blinding dust storm on Monday, deposed the city's mayor and installed a member of Iraq's most powerful Shiite militia. The deposed mayor, Alaa al-Tamimi, who was not in his offices at the time, recounted the events in a telephone interview on Tuesday and called the move a municipal coup d'état. He added that he had gone into hiding for fear of his life. "This is the new Iraq," said Mr. Tamimi, a secular engineer with no party affiliation. "They use force to achieve their goal." The group that ousted him insisted that...