A concert-goer captured the moment

a bomb went off at the British venue

where pop star Ariana Grande had just finished a sold-out show.

The short video — shot inside the 21,000-seat Manchester Arena on Monday night — shows concert attendees calmly walking from their seats toward the exits as background music plays when suddenly a loud blast goes off, sparking mass chaos.

Screams can be heard the moment the blast rocks the venue.

“Oh my God … what just happened … what’s going on … oh my God!” the woman who took the video can be heard saying, as pandemonium ensues.

ISIS has claimed responsibility for the suicide attack, which killed 22 people, including an 8-year-old child, and injured 59 others.