Israeli forces have raided the West Bank cities of Nablus, Qalqilya and Ramallah and detained 11 Palestinians. Palestinian security sources on Thursday said the detainees were taken from their houses over the night. Meanwhile, militants and Israeli troops exchanged fire on the northern border of Gaza strip. <br/><br/>The Popular Resistance Committee (PRC), an armed group close to Hamas, said its militants engaged with the Israeli troops that entered the border area in the dead of night. There have been no reports of casualties in the clashes.