By Grady Smith
Updated September 23, 2012 at 08:08 PM EDT
Christopher Polk/Getty Images

On the heels of his epic onstage meltdown at the iHeartRadio festival on Friday night, Green Day lead singer Billie Joe Armstrong is headed to treatment for substance abuse.

The rockers have also announced that some upcoming promotional appearances for their forthcoming disc Uno! (due Sept. 25) have been canceled.

Green Day posted this message on its official Facebook page Sunday:

“Billie Joe is seeking treatment for substance abuse. We would like everyone to know that our set was not cut short by Clear Channel and to apologize to those we offended at the iHeartRadio Festival in Las Vegas. We regretfully must postpone some of our upcoming promotional appearances.”

The band did not disclose what sort of substance abuse Armstrong will be treated for, and emails to both the band’s personal and record label representatives from EW have not been returned at this time.

During their iHeartRadio set, Green Day smashed their guitars and stormed off the stage following an expletive-laden rant by Armstrong, who seemed to feel the band’s set was being cut short.

Read more:

Billie Joe Armstrong rants at iHeartRadio festival: ‘I’m not f–ing Justin Bieber’

Green Day now streaming new album ‘Uno’ in full on Facebook