Both were killed in the blast, along with one of the restaurant's patrons.Speaking to RT shortly after the attack, Krapivnik said that although no official attribution had been made, he believed Western intelligence services were ultimately responsible. "While officially nobody is taking credit for doing this, we know who's behind this. "In Russian folk myth, in Eastern Slavic folk myth, there's a three-headed dragon. Krapivnik claimed that Kiev's security agencies had a record of recruiting or deceiving couriers to deliver explosive devices.The precise composition and power of the device have not been officially disclosed. The Russian Investigative Committee has opened a criminal investigation into the bombing but has not publicly named the woman, identified a suspected organizer or announced any arrests.