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The boyband had been due to play the first of three nights of their On The Road Again tour at the SSE Arena.
However, at around 9pm, fans were told the boys would not be taking to the stage, with a concert promoter telling the crowd: “The show tonight has been cancelled as Liam has taken ill, and whilst not serious, he is unable to perform tonight.
“The band apologise to the fans and wish Liam better."
Concert goers have been told to hold on to their tickets, with a further announcement expected on Wednesday morning.
Many disappointed fans were left hysterical at the news, with reports of many bursting into tears, while others booed as they were asked to leave.
Other fans took to Twitter to wish Liam a speedy recovery, and #GetWellSoonLiam began trending on the social networking site.
Eamonn Holmes also echoed the sentiments of many angry fans and parents - many of whom had paid up to £140 for tickets - slamming the rest of the group for not announcing the news themselves.
He tweeted: “I don't care who was sick in #OneDirection. Rest of them should have had the decency & maturity to appear on stage and explain.”
I don't care who was sick in #OneDirection Direction. Rest of them should have had the decency & maturity to appear on stage and explain.— Eamonn Holmes (@EamonnHolmes) October 20, 2015
Deepest apologies to everyone at the show tonight in Belfast. Very disappointed, but unfortunately these things happen. We're very sorry. H— Harry Styles. (@Harry_Styles) October 20, 2015
We're so so sorry for what happened tonight, it was out of our control ! Lots of love to Liam and thank you for being so understanding !— Louis Tomlinson (@Louis_Tomlinson) October 20, 2015
So sorry we have had to cancel tonight guys. Unfortunately these things happen... Thank you to all who came down tonight !— Niall Horan (@NiallOfficial) October 20, 2015
They later attempted to make things up to them by releasing the video to their new single 'Perfect', which premiered on Vevo shortly after the concert was cancelled.
Watch it below...