NABLUS, West Bank (Reuters) -Israeli forces killed a Palestinian passerby during a raid on a refugee camp in the occupied West Bank on Tuesday that set off a two-hour gunfight with armed fighters, witnesses and the Palestinian health ministry said. Violence in the West Bank, among territories Israel occupied in the 1967 Middle East war and which Palestinians want as the core of an independent state, has risen sharply during the past year. Israel has intensified its military raids amid a spate of