In the week since it captured Iraq’s second-largest city, Mosul, a Muslim extremist group has tried to win over residents and has stopped short of widely enforcing its strict brand of Islamic law, residents say. Churches remain unharmed and street cleaners are back at work. Getting around is easier now that much-despised blast walls and security checkpoints are gone. But the militants’ restraint may only be temporary: In Fallujah, a city west of Baghdad that the group and its tribal allies solidified control over at the start of the year, residents say the militants have begun meting out Shariah, or Islamic law, punishments in private, flogging lawbreakers and cutting off thieves’ hands. And across the Syrian border in their urban stronghold of Raqqa, the insurgents are much more open about their ideology, killing people execution-style in the main square, banning music and imposing an Islamic tax […]