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Beirut, Aug 4: A massive explosion has shaken the Lebanese capital of Beirut, with a very high number of casualties expected.

A warehouse at the Beirut Port caught fire on Tuesday afternoon, triggering a huge explosion, Lebanon’s official National News Agency (NNA) reported.

Several smaller explosions were heard before the bigger one occurred.

Abbas Ibrahim, the head of Lebanon’s General Security, said that “highly explosive materials” confiscated earlier had been stored at the site.

Footage shared on social media captured the moment of the bigger explosion, with a colossal shock wave seen traveling fast across several hundreds of meters and shrouding the area in thick smoke.

The blast left enormous material damage to the surrounding buildings and structures. But it was not immediately known how big an area was affected.

There was also no immediate casualty count. Graphic amateur video from the scene showed bodies strewn on the ground, with their clothes blown off.

The NNA said rescue operations were underway. Ambulances were seen heading toward the scene in central Beirut.

Lebanese LBC television channel quoted Lebanon’s Health Minister Hamad Hasan as saying that the blast had caused a “very high number of injuries” and “extensive damage.”

Beirut Governor Marwan Abboud said an unspecified number of firefighters dispatched to extinguish the initial fire had been killed in the explosion.

“As they were putting out the fire, the explosion took place and we’ve [lost them],” he said, breaking down on live TV.

The explosion comes at a time when the Arab country is passing through its worst economic and financial crisis in decades, and amid rising tensions with Israel.

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.