BAGHDAD, Iraq - Soldiers arrested 18 people in a deadly missile barrage last month that Deputy Defense Secretary Paul Wolfowitz narrowly escaped, officials said Sunday. U.S. warplanes bombed near a center of Iraqi resistance, and the military said it was intensifying the fight against insurgents after increasingly bloody attacks. The U.S. command also announced the death of another soldier, killed late Saturday when his vehicle struck a land mine in Baghdad. A senior Iraqi official warned that mounting violence may delay steps toward a new constitution, considered a major condition for returning the country to full Iraqi rule. Lt. Col....