abidjan ivory coast authorities arrest senior aide parliament speaker guillaume soro monday prosecutor say accuse possess distribute weapons destabilize state army mutiny early year arrest soro protocol chief souleymane kamarate kone associate could deepen rift powerful former rebel leader president alassane ouattara renegade soldier second city bouake use weapons take kone home halt advance loyalist troop send put four-day uprise may soon mutiny prosecutors open investigation arm cache state prosecutor christophe adou say contain six tonnes weapons ammunition possession concealment weapons illegal manner distribution aim destabilize state adou tell reporters commercial capital abidjan inquest arrest warrant open persons involve add around 15 people question investigation include soro head security deputy unclear however addition kone target arrest kone take custody question monday could reach comment ally soro say investigation politically motivate kone ... already serve prison 2000 cause president alassane ouattara strong man remain dignify spokesman soro country write statement statement also call supporters remain calm judicial process remain independent soro head northern rebellion 2002 2011 help ouattara power predecessor laurent gbagbo refuse accept defeat 2010 election however split open president former ally year soro consider one main contenders take ouattara run re-election 2020 face stiff opposition rule rdr party diplomats analysts worry series army mutiny begin january may symptom jockey position political figure ahead 2020 vote arrest kone soro associate likely increase tensions include within army parliament speaker still command loyalty many thousands former fighters serve soldier aide ivory coast parliament speaker arrest arm cache