More than 70 people have died after a huge explosion erupted in the Lebanese city of Beirut.
The cause of the blast, which has also injured more than 2,750 people, is still unknown.
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Lebanon's Interior Minister believes stores of ammonium nitrate likely caused the blast, according to The Guardian, with the warehouse holding the chemical receiving warnings as far back in 2014.
Lebanon Prime Minister Hassan Diab has declared a national day of mourning for the victims of the tragedy.
The BBC says hospitals are now struggling to cope and are becoming overwhelmed with casualties.
In the clip posted on Twitter, which appears to have been taken from a rooftop nearby, a large cloud of smoke suddenly erupts into the air as a deafening noise ripples through the city.
It was posted with the caption: "A video I received on WhatsApp of the scale of explosion in #Beirut, confirming it was at the port.
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"FYI - this comes at one of the worst times in Lebanon's history, a deep economic crisis with more and more of the population unable to access food, health care. The general mood was that it can't get worse.
"Many people barely surviving and now more have lost their livelihoods, shops and cars destroyed."
Lebanon's Health Minister has told local media outlets the blast caused 'a very high number of injuries', with photographers at the scene witnessing many of the injured lying on the ground.
Homes and buildings have also said to have been damaged as far as 10km (6 miles) away from where the explosion occurred.
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"The apartment shook horizontally and all of a sudden it felt like an explosion and the windows and doors burst open. The glass just broke. So many homes were damaged or destroyed."
Sky News reporter Zein Ja'far was in downtown Beirut when the explosion happened.
He said: "It tore apart the facade of the building we're in, and once the dust settled we managed to get ourselves and others in this block outside.
"Windows, doors and glass were shattered across downtown Beirut and there were a lot of very dazed, bloody people walking around, trying to gather their bearings."
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Speaking to CNN, one Beirut resident who was several kilometres away at the time the explosion happened said their windows were blown through.
Rania Masri said: "What I felt was that it was an earthquake.
Countries such as the UK, France, the US, Canada and Israel have all pledged support to Lebanon.
Featured Image Credit: PA