Israeli forces opened fire and killed a Palestinian man in the West Bank Thursday after the man had barricaded himself inside his house to avoid arrest. The Palestinian Authority described the killing as an assassination, saying Israeli forces shelled the house, destroyed a part of it and then stormed it. The killing came on the same day that Amnesty International accused Israeli forces of using excessive violence in the West Bank, killing dozens of Palestinians over the past three years in what, they said, might constitute a war crime.