Shocking video shows the moment a bride's wedding day was destroyed by Beirut explosion

The happy couple was supposed to be celebrating their marriage.

Dr Israa Seblani and Ahmad Sbeih were on the streets of Beirut on Tuesday, posing for their wedding photos, Dr Seblani in an elegant, white wedding gown.

It was a day like any other in the city's Saifi Village, Dr Seblani, with people out and about shopping and dining in restaurants.

READ MORE: Before-and-after satellite images of Beirut explosion show massive devastation

Then all of a sudden, there was a loud noise.

Seconds later, an eardrum-shattering blast erupted behind her.

The horrifying sound was the massive explosion which rocked the Lebanese capital, leaving at least at least 135 dead and 5000 injured.

Mahmoud Nakib, the couple's wedding photographer, captured the moment it all went down.

"We were filming an outdoor photo session … then we heard an explosion," Mr Nakib said.

"That was the first explosion, we thought that is was far away, we continued filming normally."

But that soon changed.

"In just one second, the sky turned black and we heard the second explosion," Mr Nakib said.

As the explosion went off, an intense gust of wind created by the shockwave roared through the square, the video showed.

"The area I was in, within matter of seconds, it went from beautiful place to ghost town filled with dust, shattered glass and people yelling [and] bleeding," Dr Seblani said.

"It was like a nightmare scene."

The shockwave pushed Mr Nakib down the street, he said, nearly knocking him over.

But his camera kept rolling, shakily documenting the chaotic scene for a few seconds longer.

Dr Seblani, Mr Nakib and the rest of the wedding party headed inside as the blast echoed through the streets of Beirut.

Everyone in the wedding party is doing OK, and no one was hospitalised.

"I thought first of my wife and my daughter," Mr Nakib said thought as he ran for cover.

"I called her to let her know that I'm fine and do not go out.

"And I went live at Facebook to let people know what happened."

The explosion in the Lebanese capital wiped out entire city streets, displaced hundreds of thousands of the city's residents and damaged structures as far as six miles away.

It has been linked to a warehouse storing thousands of tons of an unsecured and volatile chemical compound, though it's still not exactly clear what led to the ignition.