Saudi Arabia, Egypt, the United Arab Emirates and Bahrain early Friday issued a joint statement listing 59 individuals and 12 entities they say are both Qatar-based or funded by Qatar and connected to terrorists.
The complete "terror list" includes Qataris, Jordanians, Egyptians, Kuwaitis, Bahrainis and Libyans.
The four countries said in the statement "that the move came in the light of their commitment to fight terrorism and the drying up of sources of funding and combating extremist ideology."
The statement, which is likely to increase tension among Gulf countries, said the decision came "as a result of the continued violation by the authorities in Doha of the obligations and agreements signed by them, including the pledge not to support or harbor elements or organizations that threaten the security of States."
The countries also expressed their thanks to those supporting them "in the fight against terrorism, extremism and violence."
Saudi Arabia, Bahrain, the UAE, Egypt, Yemen and Mauritania announced this week that they were cutting diplomatic ties and closing borders with Qatar, accusing Doha of supporting terrorism and backing Iran.
Qatar's Foreign Minister Sheikh Mohammed bin Abdulrahman al-Thani told reporters in Doha on Thursday that his country will not compromise or change its foreign policies in order to resolve the crisis with its Arab neighbours.
The UAE, which is locked along with other Arab countries in an escalating dispute with Qatar, has also warned the tiny emirate that it will remain isolated unless it stops support for militant groups.
"The bottom line is that today the Qatari government has a decision to make. It can finally turn away from the destructive policies it has adopted and demonstrate true unity and solidarity with the GCC," said Sultan Al-Jaber, UAE's minister of state and head of the National Media Council, referring to the six-nation Gulf Cooperation Council.
"Or, it can continue on its current path of funding and enabling extremism. If that is what the Qatar government chooses, then it will remain isolated and suffer economic and diplomatic costs," Al-Jaber told dpa in an email interview.
Any show of sympathy for Qatar's government or objection via social media or spoken or written word to Bahrain's actions will be considered a crime and could lead to a fine and a jail term of up to five years, Bahrain said late Thursday, in a statement carried by the state-run news agency.
The UAE also has said it would punish people who sympathize with Qatar.
The crisis took Bahrain's King Hamad bin Isa al-Khalifa to Cairo Thursday, where he held talks with Egyptian President Abdel-Fattah al-Sissi.
"The two sides agreed on the importance of working to strengthen joint Arab action efforts for the benefit of Arab countries and their peoples," said Egyptian presidential spokesman Alaa Youssef.
The two leaders also stressed the necessity of intensifying efforts by the international community to reach political settlements for crises in the region, Youssef added.
Qatar, Saudi Arabia, the UAE and Bahrain are members of the US-allied GCC, which also includes Kuwait and Oman.
Qatar, an energy-rich country with a population of 2.5 million, has condemned the boycott.
US President Donald Trump offered on Wednesday to help in resolving the crisis, a day after he backed Qatar's isolation.
The current dispute is the most serious since 2014, when Saudi Arabia, the UAE and Bahrain temporarily withdrew their ambassadors from Qatar, accusing it of breaching a regional security pact.
Qatar has good relations with Iran, Saudi Arabia's regional rival.
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