Kasabian had been due to start their headline concert in Belfast at 9pm this evening but posted a message on Twitter saying that they would not be able to perform due to "illness."

It is with great regret, due to illness, we cannot perform at Customs House Belfast tonight. Kasabian.

— KasabianHQ (@KasabianHQ) August 22, 2017

Fans - some of whom had travelled from other countries - where understandably disappointed.

I fuckinf flew from Scotland to this

— key-ra (@_ciaragrahamxo) August 22, 2017

Why wait until 20:50 to tell the fans... we've been stood in the rain for nearly 3 hours! ?

— Vealey (@vealey722) August 22, 2017