Kammala wannan jumla: An yi zargin cewa Joshua ya yi hasashen hare-haren ta'addanci da dama da kungiyar ISIS, 'yan kungiyar Al-Qaeda da mayakan Al-Shabaab suka aikata, ciki har da hare-haren Nuwamba 2015 na Paris, da harin Kwalejin Jami'ar Garissa a Kenya, da
Kewaye da otal din Ouagadougou a Burkina Faso da hare-haren bam na Brussels na 2016. An kuma yi iƙirarin cewa ya yi hasashen hare-haren bam na Boston a Amurka.