People attending a pop concert by Ariana Grande fled the stadium after hearing the noises, which Twitter users have described as sounding like gunshots.
Emergency services have rushed to the scene.
One Twitter user wrote: “Honestly worst night of my existence. Just kept running from Manchester Arena for my life.”
Another added: “Just got out of Manchester arena after seeing Ariana perform. There was a loud bang when the lights came on & everyone ran out screaming.”
One eyewitness told a reporter how it went down saying “She did her last song, we were in the lower tier and there was an explosion behind us at the back of the arena. We saw young girls with blood on them, everyone was screaming and people were running. There was lots of smoke.”
More to come as info comes in.
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