In the past 10 days, the fiery Shiite cleric Muqtada al-Sadr's militia has resurfaced in force, making a push to roust Sunnis from Baghdad and to isolate Sunni enclaves in the west of the capital from their brethren in the south. Mahdi Army militiamen in the Shiite dominated neighborhood of Bayaa were reinforced by other Shiite fighters and men in civilian clothes with weapons have cordoned off the area. In the past 10 days Mahdi Army activity has escalated, intensifying in the past two days with the capture of two Sunni mosques, residents and police said. The push appears to...