RIYADH: Arab nations, including Saudi Arabia and Egypt, on Monday cut ties with Qatar, accusing it of supporting extremism, in the biggest dip-lomatic crisis to hit the region in years.

Bahrain, the United Arab Emirates, Yemen and the Maldives joined Saudi Arabia and Egypt in severing relationswith gas-rich Qatar, with Riyadh accusing Doha of supporting groups, including some backed by Iran, `that aim to destabilise the region` Qatar reacted with fury, denying any support for extremists and accusing its Gulf neighbours of seeking to put the country under `guardianship`.

The crisis was likely to have wideranging consequences, not just for Qatar and its citizens but around the Middle East and for Western interests.

Qatar hosts the largest US airbase in the region, which is crucial to operations against the militant Islamic State group, and is set to host the 2022 football World Cup.

Monday`s announcement came less than a month after US PresidentDonald Trump visited Saudi Arabia to cement ties with Riyadh and called for a united front among Muslim countries against extremism.

It also followed weeks of rising ten-sions between Doha and its neighbours, including Qatari accusations of a concerted media campaign against it and the alleged hacking of the Qatar News Agency.

The GulfstatesandEgyptsaid theywere severing diplomatic ties and closing transport links with Qatar, which relies on imports from its neighbours.

The Gulf states banned their citizensfrom travelling to Qatar and ordered Qatari citizens to leave within 14 days.

Saudi Arabia also closed its borders with Qatar, effectively blocking food and other supplies exported by land to Qatar.

Supermarkets were besieged by shoppers on Monday as many rushed to buy food, leaving shelves bare and resulting in queues up to 25-people deep at some major stores in central Doha.

The Qatar Stock Exchange tumbled eight per cent on opening and eventually closed down 7.58pc.

Riyadh said in a statement its measures were the result of `gross violations committed by authorities in Qatar`, accusing Doha of harbouring `terrorist and sectarian groups that aim to destabilise the region, including the MuslimBrotherhood,Daesh(IS)andAlQaeda`.

Gulf states have for years accused Qatar of supporting extremist groups, in particular the Muslim Brotherhood, the world`s oldest Islamist organisation.

Riyadh also accused Doha of supporting Iranbacked `terrorist activities` in Saudi Arabia`s Shia-dominated area of Qatif, as well as in Bahrain, both of which have seen sectarianunrestinrecentyears.

Any suggestion that Qatar is backing the agenda of Iran Saudi Arabia`s regional archrival is especially sensitive, particularly in the wake of Mr Trump`s comments last month.

`The measures are unjustified and are based on false and baseless claims,` the Qatari foreign ministry said in a statement.

`The aim is clear, and it is to impose guardianship on the state,` it said, insisting authorities would `take all measures necessary... to foil attempts to affect or harm Qatar`s society and economy`.

Flights cancelled Economic consequences were already emerging, with UAE carriers Emirates, Etihad, flydubai and Air Arabia, as well as Saudi Airlines announcing the suspension of all flights to and from Qatar as of Tuesday morning.

Egypt said it would also suspend air links with Qatar from Tuesday and gave Doha`s ambassador 48 hours to leave the country.

Qatar Airways said it had suspended allflights to Saudi Arabia with immediate effect, at least until the end of Monday.

The airline one of the region`s busiest also faced major potential problems after Saudi civil aviation authorities said the country`s airspace would be closed to Qatari planes.

The Saudi-led coalition battling Iran-backed rebels in Yemen said it had expelled Qatar from the group.

The coalition accused Qatar of providing `support to (terrorist) organisations in Yemen` the first time it has made such a claim.

Hints of an impending crisis emerged last month when Doha alleged that hackers were behind the release of false remarks attributed to Emir Sheikh Tamim bin Hamad Al Thani published on the Qatar News Agency website.

The stories quoted him questioning US hostility towards Iran, speaking of `tensions` between Doha and Washington and speculating that Mr Trump might not remain in power for long.

Doha denied the comments and said it had been the victim of a `shameful cybercrime` -AFP