Scale of blast hints at military-grade explosives, clarity likely in a few days

Investigators are working to identify the explosive used in Monday's blast. Initial findings suggest military-grade materials like PETN, semtex, or RDX may have been involved. Ammonium nitrate fuel oil is also being considered. Forensic teams have collected numerous exhibits for lab testing. Clarity on the exact explosive is expected soon. A sophisticated detonation system is suspected.