Overview

• Dzhumokhon Kurbonov accused of providing communication tools and financing to attackers.
• Moscow's Basmanny District Court orders Kurbonov held until May 22 pending further investigation.
• Total of twelve defendants now in custody, including four directly involved in the assault.
• Islamic State group claims responsibility; however, Russia alleges Ukrainian and Western involvement without evidence.
• Eyewitnesses describe a chaotic scene with concertgoers being shot and trampled as they attempted to escape.