Hamas leader Ismail Haniya said Thursday his Palestinian movement rejected next week's US-sponsored Middle East economic conference in Bahrain as it would amount to Arab "normalisation" of ties with Israel.
In a rare briefing with international journalists, Haniya also accused Israel of failing to abide by agreements meant to ensure calm in the Hamas-controlled Gaza Strip.
"We clearly express our rejection and non-acceptance of any Arab or Islamic country holding such a conference, which constitutes normalisation with the occupation," Haniya said, referring to Israel.
US President Donald Trump's administration organised the conference, which is to be held on June 25 and 26 in Manama for the unveiling of the economic component of a US Israeli-Palestinian peace plan.
Trump's son-in-law Jared Kushner has been drafting the long-awaited plan, but it has been rejected in advance by the Palestinians, who accuse the Trump administration of pro-Israel bias.
The political part of the conference is likely to be delayed until at least after the Israeli elections in September.
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Palestinians have also accused the United States of trying to use the potential offer of billions of dollars in investment to avoid dealing with political causes of their suffering, including Israel's occupation.
"We reject the Manama conference and the transformation of the Palestinian cause from a political cause to an economic cause," Haniya said.
Haniya also appealed to Bahrain's King Hamad "not to hold this workshop," vowing protests "in all the Palestinian lands and beyond".
Hamas and Israel have fought three wars since 2008 and fears of a fourth remain.
An agreement reached in November is supposed to ensure calm in exchange for Israel easing its blockade of the Gaza Strip.
The Jewish state has never publicly confirmed the deal but has allowed Qatar to bring millions in cash and investments into the Palestinian enclave since then.
In May the two sides came close to a new conflict, with Hamas and Islamic Jihad firing hundreds of rockets from Gaza and the Israeli military striking dozens of targets in response.
Haniya accused Israel of not implementing the agreements reached.
"The understandings today are in the danger zone, due to the failure of the (Israeli) occupation to implement what was agreed upon."