Hamas gunmen on Tuesday took up positions around the stronghold of the shadowy group holding a kidnapped British Broadcasting Corp. correspondent, stepping up the pressure to secure his release. Members of Hamas’ 6,000-strong militia moved onto high-rise rooftops and deployed gunmen in streets in the Gaza City neighborhood of the Doghmush clan. The large, heavily armed family leads the Army of Islam, a little known group that has been holding Alan Johnston for nearly four months. Full Story