Armstrong to enter rehab

Armstrong to enter rehab

Armstrong will be treated for substance abuse, according to a statement from the band released Sunday. The announcement comes just two days after the singer had an on-stage meltdown at iHeart Radio Music Festival at the MGM Grand in Las Vegas--and two days before the Grammy winning rock band's next album, "Uno," is scheduled to be released.

During the group's performance, Armstrong launched a profanity-laced tirade that ended with him smashing his guitar on stage. Not surprisingly, a clip of the tantrum was uploaded to YouTube and quickly went viral.

"Green Day would like to apologize to those they offended at the iHeartRadio Festival in Las Vegas," the band's statement reads. "The band regretfully must postpone some of their upcoming promotional appearances."