Saudi Arabia and its allies have blacklisted nine organisations and nine individuals believed to have links with terrorism and allegedly supported financially by neighbouring Qatar.
Earlier this year, Saudi Arabia, the United Arab Emirates (UAE), Bahrain and Egypt isolated Qatar diplomatically and economically after claiming it supports terrorist groups and implements policies that could jeopardise the equilibrium of the region. Doha has denied the allegations.
In a joint statement carried by the Saudi Press Agency and the the Emirates News Agency (WAM) , the four states have once again accused Doha of "harboring terrorists, financing attacks and promoting hate speech and extremism.
"The next long awaited practical step is taking an urgent action by the Qatari authorities to make legal and practical actions to prosecute terrorist and extremist individuals and entities," the statement said.
The list includes three Yemen-based organisations, and another five based in Libya.
"The terrorist activities of the aforementioned entities and individuals have direct and indirect ties with the Qatari authorities," the countries said.
"The three Qatari individuals on the list, along with a Kuwaiti individual, have engaged in fund-raising campaigns to support [Syria-based] Al-Nusra Front and other terrorist militias in Syria," read the statement.
It added that three Yemeni individuals as well as the three Yemen-based organisations have "provided support to Al-Qaeda [terror group] and have conducted actions on its behalf, mainly by using significant funding from Qatari charities, which are designated by the four states as terrorist entities".
The statement further claimed the individuals and organisations based in Libya allegedly received finds from Qatar and "played an active role in spreading chaos and devastation in Libya".
The list came days after the four states issued some demands Qatar was told to meet to end its isolation.
The demands included closing state-funded news outlet Al Jazeera, closing a Turkish military base and reducing ties with regional adversary Iran, and reducing ties with the Muslim Brotherhood, which the four countries blacklisted as a "terror group" .
Doha said the demands were not actionable and some of them violated the country's sovereignty.
In response, the four Gulf states decided to continue with the ongoing embargo.
The diplomatic and economic isolation of Qatar has sparked what has been deemed one of the worst crises in the Gulf in recent years.
It prompted Qatari citizens to stockpile goods amid fears food and water stocks would deplete as the country depends on food imports.
Iran and Turkey, which support Doha, have dispatched food supplies to Qatar. Ankara also sent a small contingent of soldiers and armoured vehicles. The two countries also deemed the list of demands given to Doha as "disrespectful" and "unacceptable".