A press release has been posted on Green Day's official website:
“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.”
He seemed fine at all the other performances and we have all seen Billie raging out at concerts before since forever. Lets wait and see what the guys themselves have to say, in their own words, about this.
Ditto above. Great work!