Rouhani said: 'Why are you showing hostility towards the people of Syria and Iraq?
Saad Hariri declared his surprise resignation on Saturday - the same day as the missile interception - from Riyadh which fuelled beliefs he was coerced into standing down against his will.
Crown Prince Mohammed bin Salman made the accusation Tuesday, referring to Iran handing ballistic missiles to Yemen's Huthi rebels, state media reported.
But Yemen's Iran-backed Huthi rebels hit back with threats of retaliation against the ports and airports of the United Arab Emirates and Saudi Arabia, which this week closed the Yemeni land, sea and air borders.
Sunday, Saudi Foreign Minister Adel al-Jubeir also warned Tehran: 'Iranian interventions in the region are detrimental to the security of neighbouring countries and affect international peace and security.'We will not allow any infringement on our national security.'Iran's Foreign Minister Mohammad Javad Zarif issued dismissive tweets over the kingdom of Saudi Arabia in response.
He wrote: 'KSA bombs Yemen to smithereens, killing 1000s of innocents including babies, spreads cholera and famine, but of course blames Iran.'KSA is engaged in wars of aggression, regional bullying, destabilising behaviour & risky provocations.