Kings Of Leon have cancelled their entire US tour, but categorically deny that they are breaking up.

The cancellation has been put down to lead singer Caleb Followill's  “vocal issues and exhaustion”.

It comes after Caleb’s meltdown at a gig at Dallas on Saturday.

Speculation over the band’s immediate future has been rife since Caleb left the stage midway through the show and did not return. They had claimed the incident was down to heat exhaustion, and subsequently postponed a show in Houston the following night.

Both gigs have been rescheduled for September.

The “Use Somebody” band consists of brothers Caleb, Nathan and Jared Followill, and their cousin Matthew Followill.

Kings of Leon have released a statement, confirming that all further gigs will also be cancelled.

The statement said: "We are so sorry to say Kings Of Leon are cancelling their entire US tour due to Caleb Followill suffering from vocal issues and exhaustion.

“The band are devastated but in order to give their fans the shows they deserve, they need to take this break."

The statement goes on to say that the band's timetable does not allow them to reschedule the 28 shows, adding that they cannot be rescheduled due to the band's international tour schedule.

Caleb's brother, and the band’s bassist, Jared, expressed his sadness at the cancellations on Twitter, saying, "Utterly depressed. It's completely out of my hands. Family has to come 1st. If bass solos & backing vocals were more popular, I'd be there."

However, Jared also tweeted the band has “internal sickness” and ’'big problems”, leading to speculation that there are deeper issues.

Drummer Nathan also tweeted: "So sorry 4 all the fans. We just need some rest. Thanks 4 understanding. WE ARE NOT BREAKING UP!"

Fans who bought Kings of Leon tickets for their cancelled US gigs will get a refund at the point of purchase. Tickets purchased online or via phones will be automatically refunded.

The band will resume touring in Canada at the Rogers Centre in Vancouver on September 28. That show was originally scheduled for September 14.