"We are so sorry to say Kings of Leon are canceling their entire U.S. tour due to Caleb Followill suffering from vocal issues and exhaustion," the band's rep said in a statement. "The band is devastated, but in order to give their fans the shows they deserve, they need to take this break."
That break means the family rock band -- known for the Grammy-winning anthem "Use Somebody" -- will not reschedule 28 dates due to the group's international tour schedule, Billboard reports. The cancellation comes after an onstage meltdown at a performance in Dallas on Friday night.
Frontman Followill walked offstage after claiming he was too hot to perform. The band then postponed its show in Houston scheduled for the next night.
Tickets that were purchased online or by telephone will be automatically refunded.
A statement from the group chalked up Friday's meltdown to "heat exhaustion and dehydration . . . causing [Followill's] vocal chords to seize."
However, the rest of the group's reaction to the incident has hinted at internal problems in the band: drummer Nathan Followill called the show a "fiasco" on Twitter, and bassist Jared Followill wrote: "I know you guys aren't stupid. I can't lie. There are problems in our band bigger than not drinking enough Gatorade."
The group originally rescheduled the Dallas and Houston shows for Sept. 21 and Sept. 22, but those dates are now also canceled.
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Kings of Leon has been on the road supporting its fifth album, "Come Around Sundown," which has sold 640,000 copies since its release last October, according to Nielsen SoundScan. The group is scheduled to tour Canada, beginning Sept. 28 in Vancouver, before heading to Australia in November.