beirut lebanon shi ite hezbollah group sunday accuse saudi arabia force lebanese prime minister saad al-hariri quit call calm effort contain political crisis unleash resignation sayyed hassan nasrallah leader iran-backed hezbollah say political escalation response hariri declaration saturday make saudi arabia come surprise even aid hariri televise speech say plot kill accuse hezbollah iranian backers sow strife arab world nasrallah say legitimate question ask whether hariri detain saudi arabia news emerge sunday royals minister investors arrest anti-corruption purge aid hariri whose family make fortune saudi construction industry strongly deny detain force resign speak televise address nasrallah say resignation saudi decision dictate prime minister saad al-hariri force nasrallah say lebanon political leaders expect hariri return lebanon thursday allow travel sunni muslim saudi arabia political ally hariri lock bitter tussle power across middle east shi ite iran ally include hezbollah lebanese president michel aoun accept hariri resignation return lebanon explain reason palace source say sunday delay politically difficult consultations successor nasrallah say would comment accusations level hezbollah hariri describe resignation announcement saudi statement hariri resignation topple coalition government include hezbollah thrust lebanon back frontline saudi-iranian regional rivalry risk open-ended political crisis government form late last year political deal end years deadlock last month produce lebanon first budget since 2005. nasrallah say think things go well want hariri quit hariri ally lebanon deny suggestions detain photograph publish twitter account show saudi arabia newly appoint ambassador lebanon walid al-yaaqoub news high-level arrest saudi arabia fuel social media speculation lebanon hariri saudi national target nasrallah say legitimate concern ask hariri anything internal struggle princes saudi oger construction firm own hariri family face multibillion-dollar debt restructure company hit decline oil price lead sharp state spend cut kingdom saudi-owned newspaper asharq al-awsat cite unnamed source close hariri speculate would probably remain outside lebanon security threat central bank governor riad salameh seek calm fear political turmoil would hit lebanon already fragile economy issue statement reaffirm stability currency peg u.s. dollar lebanon sectarian system president must maronite catholic prime minister sunni speaker parliament shi ite hariri lebanon influential sunni politician father rafik al-hariri prime minister lebanon 1975-1990 civil war assassinate car bomb 2005. u.n.-backed tribunal indict five hezbollah members kill group deny involvement saudi media publish report plot assassinate hariri recent days lebanon main security branch say information plot saudi minister say saturday hariri personal security detail confirm information plot thamer al-sabhan say interview lebanese tv station saturday threats prime minister kingdom keen security u.n. secretary-general antonio guterres concern hariri resignation hop side country would back state institutions spokesman lebanon stephane dujarric say email statement hezbollah say saudi arabia force lebanese pm quit