Four Palestinians have been killed in an Israeli arrest raid in Ramallah in the West Bank. Israeli troops and Palestinian militia members exchanged fire after Israeli armoured vehicles entered the centre of the city. At least 50 other Palestinians were wounded by live gunfire and others by rubber bullets, the director of Ramallah's hospital said.Mohammed al-Shubaki, a leading member of the Islamic Jihad group, was arrested during the Israeli operation. The Israeli killings in the West Bank came on the eve of Palestinian cross-party talks in Ramallah designed to contain factional violence.