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N-DUBZ fans claim they are "surprised they made it out alive" after a series of mass brawls broke out during the band's huge arena tour.
Terrified music lovers passed out in the crowd through sheer panic as numerous fights erupted inside the Bournemouth International Centre on Monday night.
The 00s group - made up of Fazer, Dappy and Tulisa Contostavlos - were forced to repeatedly halt their show as security stepped in.
Fans have described the scenes inside the 4,000-strong venue as "carnage" and "chaos".
One witness even claims she saw people urinating on others in the crowd.
N-Dubz lover Collette Little tweeted after the gig: "N-Dubz was absolutely chaos. I'm surprised everyone made it out alive."
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Another called Jazz warned: "Whoever is seeing N-Dubz on the rest or the tour please be careful. There was a sh*t tonne of fights and people passing out tonight."
One concert-goer who did not wish to be named, was left seriously shaken and witnessing the scenes from the BIC's balcony seating area.
She said: "There were so many fights in the crowd down below and it really scared me.
"Security did their best to throw the trouble makers out but people were so frightened.
"N-Dubz had to keep stopping the show as some began passing out in panic and needed help from the medics.
"The worst was seeing people peeing on others. It was disgusting."
She added: "I'd been looking forward to this concert for months but it ending up being a horrible experience to be there."
The Sun exclusively confirmed in May that N-Dubz were reuniting for a huge 11-date arena tour.
The band's announcement came more than 10 years after the release of their last single Morning Star.