Iran has displayed the wreckage of drones and cruise missiles which it says were used to attack its oil refinery at Abqaiq and Khurais oil field
Defence ministry said wreckage is 'undeniable' evidence Tehran was to blame
Comes after Iran says its response to any US military attack would be 'crushing'
Mohammed bin Salman described the strike as an attack on the global economy
Donald Trump is said to be considering military strikes against Iran after the US and Saudi said it had evidence Iran was responsible