An S Club live performance was evacuated mid-show on Monday night time.
M&S Bank Arena Liverpool mentioned it was conducting an investigation into the incident - later revealing it was attributable to a sensor being "triggered".
The live performance had already been rescheduled from its unique date of 13 October, when it was postponed attributable to points with the venue's energy provide.
An S Club fan, who was on the live performance, advised Sky News the band have been performing when "it all went black" and a message performed over the tannoy telling individuals within the enviornment to "evacuate immediately" and there was a "report of fire in the building".
"Most people went out but some people stayed in their seats and had to be told to leave," mentioned the fan, who requested to not be named.
She mentioned concertgoers have been in a position to return to the world after about 5 minutes however they weren't given any additional details about what brought on the evacuation.
She added that she was involved through the incident attributable to heightened fears for the reason that Manchester Arena bombing.
There had been studies by concertgoers that there was no choice to go away by way of a marked fireplace exit.
Concerns have been additionally raised that safety checks weren't carried out as followers re-entered the world.
Faye Dyer, chief government of the ACC Liverpool Group, which runs the world, apologised to concertgoers, saying "we understand the customer experience was not in line with our high standards on this occasion and for that we are sorry".
"We wish to thank the band and the audience for their patience and co-operation," she added.
"We are proud that incidents of this nature remain rare over the past 15 years of hosting successful live events."
Ms Dyer mentioned that whereas the constructing's security methods "responded appropriately", the world lights "did not automatically turn on as programmed which meant our manual systems were activated, resulting in a short delay".
She added: "We can confirm that at no point were fire exits blocked. However due to the location of the activation, our stewards directed individuals away from some arena floor fire exits towards others, while the source of the activation was investigated.
"Customer safety checks have been carried out previous to the present and - as clients remained in very shut proximity to the world for a brief period of time, on personal land monitored by CCTV and with extra visible checks put in place for re-entry - the choice was made for them to return to the world so the present might resume.
"A full check of the arena and systems was carried out in the meantime with the event deemed safe to continue."
In its preliminary assertion on Monday night time, the world mentioned the evacuation was triggered by a "minor incident" - however didn't disclose after additional particulars.
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S Club, previously often known as S Club 7, kicked off their twenty fifth anniversary reunion tour with a present in Manchester on 12 October.
But lower than 24 hours later, they have been compelled to cancel the unique Liverpool date, saying on Instagram that they have been "beyond devastated".
They advised followers the venue had "an unforeseen technical issue impacting their power supply and therefore your safety".
S Club, which now options Rachel Stevens, Jon Lee, Tina Barrett, Jo O'Meara and Bradley McIntosh, head to the US for concert events in Chicago, Los Angeles and Boston subsequent month.
Band member Paul Cattermole died in April aged 46 from coronary heart issues - shortly after the live performance dates were announced.
His bandmate and ex-girlfriend Hannah Spearritt quit the tour a number of weeks later.
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