harare president robert mugabe rule zanu-pf party want step plan hold rally zimbabwe capital harare saturday make point mugabe zimbabwe helm since independence britain 1980 face stark challenge ever rule army seize power wednesday say target criminals around nonagenarian leader zanu-pf call friday mugabe resign main state newspaper herald report clear sign age leader authority collapse army takeover newspaper say zanu-pf branch 10 provinces meet also call mugabe wife grace whose ambition succeed husband trigger political crisis resign party senior member zanu-pf early tell reuters party want long-time president go become stubborn arrange fire sunday source say do impeachment tuesday herald report zanu-pf would convene special central committee meet sunday realign revolutionary party current political developments pointedly military say fully support solidarity march apparently separate zanu-pf event harare saturday part apparent groundswell anti-mugabe sentiment unleash dramatic events past days army say approach several private volunteer organizations seek freely move express desire could orderly peaceful harare calm coup unfold arm force also say statement people warn loot army appear want mugabe go quietly allow transition emmerson mnangagwa whose sack last week vice president spark army action goal general prevent mugabe hand power wife grace 41 years junior appear cusp power mnangagwa push mugabe 93 call grand old man african politics look run options army camp doorstep grace mugabe house arrest key political ally military custody main pillars mugabe rule turn offer support police show resistance chris mutsvangwa leader zimbabwe influential war veterans say friday mugabe would allow resist military remain power zanu-pf build cult personality around leader desert mugabe revere elder statesman independence leader also revile many africa abroad accuse resort violence retain power run promise economy grind economy collapse seizure white-owned farm 2000. unemployment run nearly 90 percent chronic shortages hard currency trigger inflation price import rise much 50 percent month zimbabwe 's rule party hold rally anti-mugabe tide rise