Hamad Hassan, Lebanon's health minister, said hundreds were wounded in the explosion.

Video of the incident t shows a large column of smoke billowing from above an area of the port that houses large warehouses, before a large orange blast is seen and a massive dome-shaped blast wave shoots into the air.

Glass storefronts and windowless across the city were instantly shattered in the blast while videos and pictures shared on social media showed doors ripped form their hinges and ceilings filled with gaping holes.

The blast wave from the explosion caused extensive damage to buildings within a large radius of the blast site.

"I was kilometres away; the glass broke everywhere around me," said Al Jazeera's Zeina Khodr, reporting from Beirut.

"The explosion was felt across the city," she added. "There is chaos in the streets."

Though, the cause of the explosion is yet to be ascertain.

Check video below:

https://www.youtube.com/watch?v=xBbsQdIIa0Y