The trauma from the huge explosion will run deep, even in a city that has seen decades of war, conflict and instability.

Their scars capture the horrific moment when every pane of glass in the city shattered.

The explosion in Beirut blew out windows for kilometres around, sent cascades of glass shards flying in every direction, and killed at least 180 people and wounded more than 6,000.

The scars tell the story of where the victim was standing when a stockpile of explosive chemicals stored at Beirut's port was ignited by a fire, sending an earthquake-like jolt through the city and leaving entire blocks littered with rubble.

Shady Rizk, a network engineer, was working in a glass building across from the port and saw the fire through his window. A haunting video he shot on his phone shows the column of smoke and his reflection in the window. His colleagues can be heard exclaiming in shock in the background.

Then there was a huge impact, and all that can be heard on the video after that are cries of pain.

"I couldn't see or hear anything at first; there was void," he said. "Then, after 20 minutes, I think people heard our screams and someone came and took us to the hospital."

He needed 350 stitches, dark tracks that criss-cross his arms, legs, chest and face.

"The scars that will remain on my face and body will tell my story," he said. "They are a sign that I've been deeply hurt and a sign that I have healed."

The trauma from the explosion will run deep, even in a city that has seen decades of war, conflict and instability.

Angelique Sabounjian, a fashion model, was left with a gaping wound above her right eye from flying glass, now replaced by stitches. She, like others, is now demanding an international investigation.

"It was a kind of a nuclear bomb," she said. "This was not something normal to happen."

The blast destroyed entire neighbourhoods near the port, leaving tens of thousands of people unable to live in their homes or operate their businesses. Lebanon was already in the grip of a severe economic crisis and struggling to contain a coronavirus outbreak.