BAGHDAD — Islamist extremists are targeting the city's universities by threatening and even attacking female students who wear Western-style fashions, setting off bombs on campuses and demanding that classes be segregated by sex. At least 1,000 of an estimated 3,000 women who want to postpone their studies for fear of violence will be granted leaves of absence, a student affairs official here said. Guards at al-Kindi University in Baghdad last week arrested a man carrying nearly 10 pounds of TNT in a bag. "The terrorist admitted that he belongs to an Islamic group," university security chief Sameer al-Sumaidai said. "When...