Iran's Revolutionary Guards
Iran's Revolutionary GuardsReuters

Iran has blamed Saudi Arabia for the deadly attacks this morning in Tehran.

The Iranian Revolutionary Guard released a statement which said that Saudi Arabia was behind the attacks, during which suicide bombers and shooters attacked the Iranian parliament and mausoleum shrine of Iranian revolutionary leader Ruhollah Khomeini, killing at least 12.

Earlier, ISIS had claimed responsibility for the attacks.

"This terrorist attack happened only a week after the meeting between the US President [Donald Trump] and the [Saudi] backward leaders who support terrorists. The fact that Islamic State has claimed responsibility proves that they were involved in the brutal attack," the Iranian statement said.

The statements come amidst increased regional tensions as Saudi Arabia and other Arab countries announced earlier this week that they would be breaking diplomatic ties with Qatar, citing the county's links with Iran and "terror organizations which intend to harm the region's stability."