Israeli restrictions on cash shipments to Gaza banks, meant to weaken the territory's Hamas rulers, are largely counterproductive and ultimately harm Palestinian moderates, top international aid officials warned in a letter to Israel's prime minister. The letter, obtained by The Associated Press, was signed by World Bank President Robert B. Zoellick, International Monetary Fund Managing Director Dominique Strauss-Kahn and international Mideast envoy Tony Blair. It marked the highest-level intervention on the issue yet, following a growing cash crunch in Gaza. The three also expressed concern about a decision by two Israeli banks to sever correspondent relationships with Palestinian counterparts. The two developments "may have a considerable impact on the Palestinian economy and its institutions, and ultimately on Israel's longer-term relationship with the Palestinians," the letter said.