'Oh my God': Video captures moment blast hits at Ariana Grande concert

A concertgoer has filmed the sound of an explosion which killed 19 people at Ariana Grande's Manchester concert. 

The video, which is circulating on social media, shows fans leaving the Manchester Arena.

A loud blast can then be heard, followed by silence as the crowd tries to source the noise.

"Oh my God. What is happening? What is going on?" the voice behind the camera can be heard saying, as screams fill the room and panicked people run for the exits.

The explosion was reported to have hit the foyer of the arena. Reports say the blasts targeted people as they left the show.