By Raneen Sawafta JENIN, West Bank (Reuters) – Israeli authorities said that commandos disguised as Palestinians killed three gunmen on Tuesday in a hospital in the occupied West Bank city of Jenin, one of whom they accused of planning an imminent attack. Hamas claimed one of the dead in Ibn Sina hospital as its member. The allied faction Islamic Jihad claimed the other two, saying they were brothers. Ibn Sina said one of the brothers had been receiving treatment for an injury that paralysed his legs. Israel’s border police said the three Palestinians were killed in an operation by the force’s…