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Makkah, Jul 31: Organising this year's scaled-down hajj required "double efforts" by Saudi authorities amid the coronavirus pandemic, King Salman said Friday after being discharged from hospital following gall bladder surgery.

Only up to 10,000 people already residing in the kingdom are participating in this year's pilgrimage, compared with 2019's gathering of some 2.5 million from around the world.

"Holding the ritual in the shadow of this pandemic... required reducing the numbers of pilgrims, but it obliged various official agencies to put in double efforts," 84-year-old King Salman said in a speech read out on state television by acting media minister Majid Al-Qasabi.

"The hajj this year was restricted to a very limited number of people from multiple nationalities, ensuring the ritual was completed despite the difficult circumstances," he said.

The speech came on the occasion of Eid al-Adha, the Muslim festival of sacrifice, a day after the king left hospital following a 10-day stay for surgery to remove his gall bladder.

The hajj, which began on Wednesday, is one of the five pillars of Islam and a must for able-bodied Muslims at least once in their lifetime.

Authorities implemented the "highest health precautions" during the rituals, the king said.

Pilgrims, who were all tested for the virus, are required to wear masks and observe social distancing.

For Friday's "stoning of the devil", the last major ritual of the hajj, Saudi authorities offered the pilgrims pebbles that were sanitised to protect against the pandemic.

In a sign that its strict measures were working, the health ministry reported no coronavirus cases in the holy sites on Wednesday or Thursday.

Dubai, Aug 2: The United Arab Emirates (UAE) announced on Saturday that it has started operations in the first of four reactors at the Barakah nuclear power station - the first nuclear power plant in the Arab world.

Emirates Nuclear Energy Corporation (ENEC), which is building and operating the plant with Korea Electric Power Corporation (KEPCO) said in a press release that its subsidiary Nawah Energy Company "has successfully started up Unit 1 of the Barakah Nuclear Energy Plant, located in the Al Dhafrah Region of Abu Dhabi".

That signals that Unit 1, which had fuel rods loaded in March, has achieved "criticality" - a sustained fission chain reaction.

"The start-up of Unit 1 marks the first time that the reactor safely produces heat, which is used to create steam, turning a turbine to generate electricity," said ENEC.

Barakah, which was originally scheduled to open in 2017, has been dogged by delays and is billions of dollars over budget. It has also raised myriad concerns among nuclear energy veterans who are concerned about the potential risks Barakah could visit upon the Arabian Peninsula, from an environmental catastrophe to a nuclear arms race.

Paul Dorfman, an honorary senior research fellow at the Energy Institute, University College London and founder and chair of the Nuclear Consulting Group, has criticised the Barakah reactors' "cheap and cheerful" design that he says cuts corners on safety.

Dorfman authored a report (PDF) last year detailing key safety features Barakah's reactors lack, such as a "core catcher" to literally stop the core of a reactor from breaching the containment building in the event of a meltdown. The reactors are also missing so-called Generation III Defence-In-Depth reinforcements to the containment building to shield against a radiological release resulting from a missile or fighter jet attack.

Both of these engineering features are standard on new reactors built in Europe, says Dorfman.

There have been at least 13 aerial attacks on nuclear facilities in the Middle East - more than any other region on earth.

The vulnerability of critical infrastructure in the Arabian Peninsula was further laid bare last year after Saudi Arabia's oil facilities at Abqaiq and Khurais were attacked by 18 drones and seven cruise missiles - an assault that temporarily knocked out more than half of the kingdom's oil production.

On Saturday, Dorfman reiterated his concern that there is no regional protocol in place to determine liability should an accident or incident at Barakah result in radioactive contamination spreading from the UAE to its neighbours. 

"Given Barakah has started up, because of all the well-rehearsed nuclear safety and security problems, it may be critically important that the Gulf states collectively evolve a Nuclear Accident Liability Convention, so that if anything does go wrong, victim states may have some sort of redress," Dorfman told Al Jazeera. 

The UAE has substantial oil and gas reserves, but it has made huge investments in developing alternative energy sources, including nuclear and solar.

Experts though have questioned why the UAE - which is bathed in sunlight and wind - has pushed ahead with nuclear energy - a far more expensive and riskier option than renewable energy sources.

When the UAE first announced Barakah in 2009, nuclear power was cheaper than solar and wind. But by 2012 - when the Emirates started breaking ground to build the reactors - solar and wind costs had plummeted dramatically.

Between 2009 and 2019, utility-scale average solar photovoltaic costs fell 89 percent and wind fell 43 percent, while nuclear jumped 26 percent, according to an analysis by the financial advisory and asset manager Lazard.

There are also concerns about the potential for Barakah to foment nuclear proliferation in the Middle East - a region rife with geopolitical fault lines and well-documented history of nuclear secrecy.

The UAE has sought to distance itself from the region's bad behaviour by agreeing not to enrich its own uranium or reprocess spent fuel. It has also signed up to the United Nation's nuclear watchdog's Additional Protocol, significantly enhancing inspection capabilities, and secured a 123 Agreement with the United States that allows bilateral civilian nuclear cooperation.