The Drag Me Down singers' show in Belfast, Northern Ireland on Tuesday (20Oct15) was called off as fans waited inside the SSE Arena for the gig to start because Liam had suddenly been taken ill.

The remainder of their three-night run was thrown into doubt, but Liam has now taken to to apologise for the cancellation and assure fans he is well enough to perform.

"I'm so sorry to everybody I disappointed last night," he writes. "I'm feeling better now. I really hope everyone can make the rescheduled date on Friday. Thank you so much for all the trends and lovely messages you guys did for me it really shows how amazing u (you) guys actually are... As I said I'm feeling much better now and I really can't wait to perform and make it up to everyone later."

Liam did not reveal the nature of his illness. His bandmate Harry Styles spoke about the incident to British radio DJ Chris Evans on BBC Radio 2, saying, "He was trying to get there last night and he was just very, very ill. To be honest we feel kinda lucky that we got to this point and never cancelled one (concert), so obviously we're all very disappointed...

"But it happened so late because we were trying to get on and then it was just impossible, he wasn't well enough so we very, very much apologise to everyone. We're very sorry. We're very disappointed ourselves, as I said."

The boyband's three-night run at the venue now begins on Wednesday night, with the cancelled show rescheduled for Friday (23Oct15).