Iran has threatened 'all out war' in the event of a military strike by either Saudi Arabia or the USA.
Both countries have blamed Tehran for attacks on Saudi oil at the weekend.
And Iran's foreign minister said Iranians 'won't blink to defend our territory' and are willing to fight 'to the last American soldier' in the event of an invasion.
Mohammad Javad Zarif stressed that Iran is not looking for a war and is willing to return to the negotiating table, provided America complies with the 2015 nuclear deal Donald Trump ripped up last year.
Speaking to CNN, Zarif denied any Iranian responsibility for the attacks.
He pointed to Iran-backed Houthi rebels in Yemen, who have claimed responsibility.
Riyadh and Washington have both said they have 'undeniable evidence' of Tehran's guilt, and are now considering their next move.
Mike Pompeo described the attacks as an 'act of war' ahead of a meeting with Mohammed bin Salman, Saudi Arabia's defence minister, on Wednesday.
After the meeting he tweeted that Saudi Arabia has 'a right to defend itself' and would be supported by America.
Ahead of the meeting Salman said the strikes were an attack against the world economy, but stopped short of demanding action.
President Trump has also refused to rule out military action, saying the 'ultimate option' for him would mean starting a war and putting US boots on the ground.
France has sent investigators to Saudi to help uncover the source of the attack.
They said today claims the attack came from Yemen 'lack credibility'.
Colonel Al-Maliki admitted that Saudi Arabia has not yet pinpointed the exact launch site, but said the ultimate responsibility for the attack must lay with Iran because such weapons could only be launched with the regime's help.
US officials say they have evidence the attack was launched from an Iranian airbase on Iranian soil, though that evidence has not yet been made public.
Iran and Saudi Arabia are currently fighting what has been dubbed a 'proxy war' in Yemen.
The Sunni kingdom is leading a coalition which has been fighting against the Houthis in Yemen since 2015, leaving hundreds of thousands dead and the country facing widespread starvation.
