ISRAEL arrested a politician from the Palestinian Islamist movement Hamas today, Palestinian security forces said. Fadel Hamdan was detained tonight after about two dozen Israeli army jeeps ringed the area of Ramallah where he was based, security forces said. Overnight, Israeli forces also arrested Aziz Dweik, the Hamas speaker of the Palestinian parliament. Israeli troops detained 64 other leading Hamas figures, including eight ministers and 26 MPs, on June 29.The ruling Islamist Hamas movement is