According to Israeli sources, at least 12 of the 18 people killed in an airstrike on the West Bank were said to have been Palestinian extremists. Ten of them belonged to Hamas and two to the Palestinian Islamic Jihad (PIJ), the Israeli military said on Saturday. Initially, the military had reported at least seven extremists killed. Hamas claimed that eight of the men killed were members of their group. The PIJ named one person as its member. The armed wing of the Fatah party of Palestinian President Mahmoud Abbas in the West Bank also stated that one man was their member. Among the casualties …