8-10 minutes - Source: BBC

The blast killed at least 100 people and injured more than 4,000 others.
The whole city was shaken by the explosion and a mushroom cloud could be seen spreading over the port area.
President Michel Aoun said the blast was caused by 2,750 tonnes of ammonium nitrate stored unsafely in a warehouse.
Ammonium nitrate is used as a fertiliser in agriculture and as an explosive.
What happened?
The explosion occurred just after 18:00 (15:00 GMT) on Tuesday after a fire at the port.Eyewitness Hadi Nasrallah says that he saw the fire but did not expect the blast. "I lost my hearing for a few seconds, I knew something was wrong, and then suddenly the glass just shattered all over the car, the cars around us, the shops, the stores, the buildings. Just glass going down from all over the building." he told the BBC.
The BBC's Lina Sinjab said she could feel the wave of the explosion from where she was, a five-minute drive from the port area . "My building was shaking, it was about to fall, all windows were forced open," she said.
BBC journalist Rami Ruhayem said there was chaos in the aftermath of the blast as ambulances with their sirens wailing inched their way through heavy traffic to get to the site. "Shards of glass blanketed the highway leading into Beirut from the north, as a tractor cleared the rubble."
The head of Lebanon's Red Cross, George Kettani, described it as a "huge catastrophe", adding: "There are victims and casualties everywhere."
His organisation said more than 100 people had died and that a search and rescue operations was still under way to locate the more than 100 people missing.
Journalist Sunniva Rose said there was still smoke going up into the sky late into the evening. "The whole city was black. It was very hard to walk around, people were covered in blood. I saw an 86-year-old woman being treated by a doctor who had just run out of his home with a first aid kit."
What triggered it?
Officials said that an investigation was under way to find the exact trigger which caused the ammonium nitrate - which had reportedly been stored in a warehouse after it was unloaded from a ship impounded at the port in 2013 - to explode.British former intelligence officer Philip Ingram told the BBC's Today programme that ammonium nitrate could only be turned into an explosive substance under certain circumstances.
It is highly explosive when it comes into contact with fire - and when it explodes, ammonium nitrate can release toxic gases including nitrogen oxides and ammonia gas.
There are strict rules on how to store it safely - including requiring the storage site to be thoroughly fire-proofed, and not have any drains, pipes or other channels in which ammonium nitrate could build up and create an additional explosion hazard.
Mr Ingram said that safely stored it was relatively safe but that in confined space and when contaminated with items such as fuel oil it could cause an explosion.
Lebanon's Supreme Defence Council said those found responsible for the explosion would face the "maximum punishment" possible.
What's the background?
The explosion comes at a sensitive time for Lebanon. With Covid-19 infections on the rise, hospitals were already struggling to cope. Now, they are faced with treating thousands of injured people.The country is also going through an economic crisis. Lebanon imports most of its food and large quantities of grain stored in the port have been destroyed causing fears of widespread food insecurity to come.
The future of the port itself is in doubt due to the destruction caused and with many building and homes reduced to an uninhabitable mess of glass and debris many residents have been left homeless.
President Aoun announced that the government would release 100 billion lira (£50.5m; $66m) of emergency funds but the impact of the blast on the economy is expected to be long-lasting.
The blast happened close to the scene of a huge car bombing which killed former Prime Minister Rafik Hariri in 2005. A verdict is due in the trial of four men accused of orchestrating the attack on Mr Hariri at a special court in the Netherlands.
Even before the blast, tensions were high in Lebanon, with street demonstrations against the government's handling of the worst economic crisis since the 1975-1990 civil war.
There has also been tension on the border with Israel, which said last week that it had thwarted an attempt to infiltrate Israeli territory by Hezbollah, a militant Shia Islamist organisation that wields considerable power in Lebanon.
But a senior Israeli official has told the BBC that "Israel has no connection" to the Beirut blast.
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