UN rights chief condemns Israeli 'siege' of Gaza, militants' taking of hostages'

[Collection]Israeli air strikes targeted residential buildings and schools in the Gaza Strip, according to the UN Human Rights chief. The UN also condemned the mass killings by Palestinian armed groups and the abduction of hostages. The Israeli military has called up 300,000 reservists and imposed a total blockade on Gaza, possibly in preparation for a ground assault. The air strikes have hit UN relief agency premises and resulted in civilian casualties.