Saudi Arabia and its allies on Tuesday announced that they had blacklisted certain charity groups and individuals with ties to Yemen, Qatar and Libya over suspected ties to extremism.

Saudi Arabia, the United Arab Emirates, Bahrain and Egypt released a joint statement naming nine charity organisations and nine individuals “directly or indirectly linked to Qatari authorities” as “terrorist”, according to a statement carried by the SPA state news agency.

Last month, the four Arab states suspended ties with Qatar over allegations that the Gulf state bankrolled Islamist extremism — an accusation Doha has consistently denied.

The four states recalled their ambassadors from Doha, banned Qatar from using their airspace and ordered all Qataris to repatriate.

Among the demands of Riyadh and its allies are the closure of Qatari broadcast giant Al-Jazeera, which has been banned in Saudi Arabia and the UAE.

Three organisations in Yemen and six based in Libya were accused of ties to Al Qaeda and a Syrian affiliate of the group in Tuesday's statement.

The statement also said three Qatari nationals, three Yemenis, two Libyans and a Kuwaiti citizen were involved in “fundraising campaigns to support Jabhat al-Nusra and other terrorist militias in Syria”.

Kuwait has not joined the states boycotting Qatar and is leading mediation efforts to resolve the crisis, the worst to hit the Gulf since the establishment of the Gulf Cooperation Council in 1981.

Saudi Arabia and the UAE lead an Arab military coalition allied with the Yemeni government in a violent war against Yemen's Iran-backed Huthi rebels.

The war has killed more than 8,000 civilians since the coalition intervened in 2015, according to the World Health Organization.