Hamas has denied that it is in financial crisis but says it faces liquidity problems stemming from inconsistent revenues from tax collection in the Gaza Strip and foreign aid.
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The movement receives undisclosed sums of cash from Iran, which has acknowledged providing financial and political support to Hamas.
One diplomat, who asked not to be identified, said intelligence reports showed that Iran had reduced funding for Hamas.
Other diplomatic sources, also relying on intelligence assessments, said the payments had stopped over the past two months.
The diplomats cited Iran's displeasure over Hamas' refusal to hold rallies in support of Tehran's ally, Assad, in Palestinian refugee camps in Syria after an uprising against his rule. Hamas' leadership outside the Gaza Strip is headquartered in Damascus.
Hamas is also widely believed to receive money from the Muslim Brotherhood, Egypt's most popular and organised political force. Diplomats said those payments also may have been reduced because the Brotherhood has diverted funds to support the so-called Arab Spring revolts.
In a sign of a cash crunch, the Hamas government in Gaza has failed to pay the July salaries of its 40,000 employees in the civil service and security forces. Hamas leaders promised full payments in August, but not all employees received their wages as scheduled on Sunday.
In 2010, Hamas put its Gaza budget at $540 million, with local revenues from taxes on merchants and on goods brought in from Israel and through smuggling tunnels under the Egyptian border accounting for only $55 million.
They include farms, greenhouses, entertainment facilities and restaurants in areas from which Israel withdrew in 2005.
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