Kings of Leon cancel U.S. tour, Followill exhausted

Rockers Kings of Leon canceled their entire U.S. tour on Monday, citing health concerns for frontman Caleb Followill after he abruptly walked off the stage at a show in Dallas saying he couldn't sing.

Followill, the lead singer of the Grammy Award-winning band behind hit tune "Use Somebody", is "suffering from vocal issues and exhaustion," a band spokesman 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," the spokesman said.

At Friday night's show in Dallas, Followill initially told the crowd that despite feeling "100 percent gone" he was going to go backstage vomit, drink a beer and then "come back out and play three more songs."

After Followill did not return, fellow band members had to tell a booing crowd that the show was in fact over.

One night later, the band's troubles in the Lone Star state continued when it was forced to cancel its Saturday night show in Houston.

While it is unclear exactly what ails Followill, his brother and Kings of Leon bassist, Jared Followill, tweeted on Monday that "There are internal sicknesses and problems that have needed to be addressed ... I can't lie," and "There are problems in our band bigger than not drinking enough Gatorade."

There will be no rescheduling of any US shows as the band's international tour dates conflict. All tickets purchased will reportedly be refunded.

For now the band plans to resume their tour by performing at Rogers Center in Vancouver, British Columbia on September 28. The original show was originally scheduled for September 14.

Hailing originally from Tennessee, Kings of Leon is a platinum-selling group with five albums released including their latest effort "Come Around Sundown" which hit stores in 2010.