Iran says Saudi Arabia was Behind Deadly Tehran Parliament Building Attack Claimed by ISIS

Iran's Revolutionary Guard has accused Saudi Arabia of being behind an ISIS attack which killed 12 people and wounded 35 at the country's parliament and a shrine to Ayatollah Kohmeini on Wednesday.

A statement published by state-backed media said: 'This terrorist attack happened only a week after the meeting between the U.S. President Donald Trump and the Saudi backward leaders who support terrorists. 

'The fact that Islamic State has claimed responsibility proves that they [Saudi Arabia] were involved in the brutal attack.' 

ISIS earlier said fighters armed with AK47s and pistols stormed parliament through the civilian entrance while disguising themselves as women by wearing burkas, shooting security guards before detonating a suicide bomb, killing at least five and wounding 25.

Meanwhile two more suicide bombers attacked a shrine to Ayatollah Khomeini, the founder of modern-day Iran, as another suicide device was detonated, killing at least two and injuring another 10.

Iran's accusation dramatically escalates tensions on the Arabian Peninsula just days after Saudi Arabia led a group of six nations in cutting ties with Qatar, accusing the country of backing 'Iranian terrorist groups'.