In the aftermath of Friday's terrorist attack at a concert venue outside Moscow (when armed men in combat fatigues opened fire and then set the place ablaze), the death toll has now climbed to more than 130. Although ISIS claimed responsibility, Russian President Vladimir Putin has pointed a finger at Ukraine, a charge Ukraine flatly denies. CBS News foreign correspondent Debora Patta reports. "CBS News Sunday Morning" features stories on the arts, music, nature, entertainment, sports, history, science and Americana, and highlights unique human accomplishments and achievements. Check local listings for CBS News Sunday Morning broadcast times. Subscribe to the "CBS News Sunday Morning" YouTube channel: https://youtube.com/CBSSundayMorning Get more of "CBS News Sunday Morning": https://cbsn.ws/1PlMmAz Follow "CBS News Sunday Morning" on Instagram: https://instagram.com/cbssundaymorning/ Like "CBS News Sunday Morning" on Facebook: https://facebook.com/CBSSundayMorning Follow "CBS News Sunday Morning" on Twitter: https://twitter.com/CBSSunday Subscribe to our newsletter: https://cbsnews.com/newsletters/ Download the CBS News app: https://www.cbsnews.com/mobile/ Try Paramount+ free: https://paramountplus.com/?ftag=PPM-05-10aeh8h For video licensing inquiries, contact: [email protected]