Kings of Leon have been forced to cancel their entire U.S tour as member Caleb Followill is suffering from "vocal issues and exhaustion". 

The band had a particularly bad experience during a gig in Dallas on July 29 where Caleb told the audience, "I'm gonna go backstage for a second. I'm gonna vomit, I'm gonna drink a beer", and proceeded to leave the stage causing the show to finish early. 

This incident prompted Jared to write a message of sincere apology to his fans on Twitter that alluded to more serious issues, which read:

"I love our fans so much. I know you guys aren't stupid. I can't lie. There are problems in our band bigger than not drinking enough Gatorade."

Now, the situation appears to have taken a turn for the worst as the band's whole tour has been called to a permanent halt and a statement on Kings of Leon's official website explains that the dates can't even be rescheduled as their calendar is fully booked:

"We are so sorry to say Kings of Leon are canceling their entire US tour due to Caleb Followill suffering from vocal issues and exhaustion. The band is devastated, but in order to give their fans the shows they deserve, they need to take this break."

"Unfortunately, the US dates cannot be rescheduled due to the band's international tour schedule. Tickets will be refunded at point of purchase. Tickets purchased online or via phones will be automatically refunded. The band will resume touring in Canada at the Rogers Center in Vancouver, BC, on September 28th. That show was originally schedule for September 14th."

Watch fan-recorded footage of Caleb's early exit from the Dallas gig below: