Social media users have posted videos of the moments immediately after explosions were heard at an Ariana Grande concert in Manchester, UK.
The videos show fans pouring out of the Manchester Arena as a convoy of emergency vehicles rushed to the scene.
Grande's label has told media the pop star is "okay" after the incident, but multiple deaths have been confirmed by local police.
One Twitter user said security at the show failed to check anyone's bags.
Newshub.
