Images:Instagram @ArianaGrande, Twitter @hannawwh
UPDATE: UK authorities have confirmed they are treating a reported explosion at Ariana Grande's concert as a terrorist incident, until they can rule otherwise.
They have confirmed 19 people have died and around 50 others are injured after two "loud bangs" were heard at the end of the concert set.
It's not yet confirmed how the explosions occurred - eye witnesses suggest the injuries occurred as crowds tried to escape the stadium, while there are unconfirmed reports of 'nails' flying through the air and hitting people.
Ariana Grande has been confirmed to be safe and uninjured.