Oasis guitarist Noel Gallagher claims “verbal and violent intimidation” led to his decision to leave the “Britpop” band. In a letter to fans posted to the band's Web site Saturday, Gallagher also apologizes for having to cancel European concerts. The posting says “the level of verbal and violent intimidation towards me, my family, friends and comrades has become intolerable.” Gallagher offers no details about what the intimidation was.