Reuters reports Islamic State fighters have abducted 100 Sunni Muslim tribesmen near the city of Tikrit, local tribal leaders said on Wednesday, apparently to neutralize suspected opponents before a widely expected army offensive. Iraqi soldiers and pro-government Shi'ite militias have been massing for days in preparation for an attack on Islamic State strongholds along the Tigris River to the north and south of Tikrit, hometown of executed former president Saddam Hussein. Tikrit, about 150 km (95 miles) north of Baghdad, has been controlled by the Sunni Muslim radicals since they swept through northern Iraq in June, scattering Iraq's security forces. Tribal leaders said Islamic State fighters had detained 42 Sunni tribesmen in the village of Rubaidha on Tuesday whom they suspected of being ready to take up arms against them. "They broke into the houses and asked for mobiles," said Hatam al-Obeidi, a Rubaidha resident who escaped to the town of Tuz Khurmatu on Wednesday.