explosion in Bulawayo

who threw the bomb in Bulawayo?

AlJ report:

Although Mnangagwa pleaded for unity and peace after he survived the blast, Eldred Masunungure, a political analyst and academic, expressed scepticism about the possibility of a peaceful election next month. Masunungure told Al Jazeera that although the climate towards the polls seemed more promising of less violence compared to other elections since 2000, the explosion sullied hopes for an election free of tension.