A key life-line in Gaza - shut down.<br/> <br />The main UN humanitarian agency for Palestinians suspended operations in Gaza Thursday.<br/> <br />The move came after demonstrators stormed its headquarters, angry over news it was scaling back aid to Gaza's neediest residents because of budget cuts.<br/> <br />The UN agency's chief, Filippo Grandi, said they won't re-open their doors until local authorities give security guarantees.<br/> <br />(SOUNDBITE) (English) UNITED NATIONS RELIEF AND WORKS AGENCY (UNRWA) COMMISSIONER-GENERAL, FILIPPO GRANDI, SAYING:<br/> <br />"We can have no tolerance whatsoever for aggressive behavior towards our installations and our staff in particular, and this is what happened yesterday. There was a pre-organized demonstration, and demonstrations are fine, but not when they turn violent and very risky."<br/> <br />But on Friday, the Hamas government in Gaza said the UN agency was over-reacting and urged it to resume work there.<br/> <br />Two-thirds of Gaza's population depends on the agency