On Monday, Saudi Arabia, Bahrain, Egypt, the United Arab Emirates, Yemen and the Maldives severed ties with Qatar, accusing it of backing terrorism, and imposed punitive measures.
Financial support for jihadists across the Middle East lies at the heart of Arab powers' row with neighboring Qatar, an Emirati minister said on Wednesday, identifying three individuals his government wanted Doha to rein in.
Foreign Minister Sheikh Mohammed bin Abdulrahman al-Thani spoke as would-be mediators ranging from U.S. President Donald Trump to Kuwait's ruling emir struggled to ease a crisis that Qataris say has led to a blockade of their nation.
The UAE, along with nine other countries, chose to cut ties with Qatar over its alleged support for terrorism.
Sheikh Mohammed said Iran had told Doha it was ready to help with securing food supplies in the emirate, an investment powerhouse and supplier of natural gas to world markets but tiny and reliant on imports. "A political, economic and social aggression", a Qatari diplomat said.
Qatar's USA ambassador, Meshal bin Hamad Al Thani, told The Associated Press his country is counting on Washington to persuade Saudi Arabia and others to back down.
Marri said he would raise his concerns with a team from Amnesty International on Wednesday and would also appeal to United Nations human rights chief Zeid Ra'ad Al Hussein to intervene.
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Turkish President Recep Tayyip Erdogan voiced his support for Qatar, saying that the isolation of the oil-rich country is not in anyone's interest.
The UAE's national postal service, Emirates Post Group, suspended all postal services to Qatar, state news agency WAM said, the latest in a series of measures degrading commercial and communications links with Doha. On the call, he reiterated "the importance of maintaining a united Gulf Cooperation Council to promote regional stability, but never at the expense of eliminating funding for radical extremism or defeating terrorism", the White House said in a statement.
"We have moved from severing diplomatic relations to a comprehensive blockade of worldwide conventions and human rights conventions, not only for Qataris but also for citizens of the (Persian) Gulf Cooperation Council countries", Marri told a press conference.
Saudi Arabia and its allies accuse Qatar of sponsoring extremist groups, some allegedly linked to Riyadh´s arch-foe Iran, fomenting trouble across the region. Qatar's emir has said such a view is a big mistake.
Trump's account that he was consulted before the Saudi-led move against Qatar contradicted the narrative offered by the State Department earlier in the week.
Regional tensions, already high following the diplomatic dispute, ratcheted up further after militants attacked targets in Tehran on Wednesday, killing at least 12 people. Saudi Arabia has closed Qatar´s only land border.