On Tuesday Hassan Nasrallah, leader of Iran proxy terror group Hezbollah, blamed Saudi Arabia for being behind the bombing of an Iranian embassy in Beirut last month. The attack killed 25, including cultural attaché of the embassy Ebrahim al-Ansari.
The bombing was claimed by an Al Qaeda linked terrorist group, saying it was meant as a message for Iran to remove its troops from Syria where they are aiding President Bashar Assad.
Nasrallah, appearing on Lebanese TV, acknowledged the claim, but asserted that Saudi intelligence provided backing and support for the attack, reports Al Jazeera.
The Hezbollah leader further blamed Saudi Arabia for being behind the spike in attacks in Iraq that have many fearing an all-out sectarian war.
The attack on Saudi Arabia reverses earlier Hezbollah accusations that claimed Israel was behind the embassy attack.
Following the embassy bombing, Saudi Arabia urged its citizens to flee Lebanon due to instability in the country.
This is not the first time Nasrallah has opened fire verbally on the Saudis. In late October he blamed the Gulf kingdom of blocking political solutions to the Syrian crisis.
The accusations from Iranian-backed Hezbollah come despite Iranian Foreign Minister Javad Zarif saying on Sunday that his country wanted to start a "new page" with Saudi Arabia.
The two nations have been at odds over the Syrian war, with Iran backing Assad's regime while Saudi Arabia sides with the opposition forces.
In addition, Iran's nuclear program is a huge source of friction and rivalry. Reports posit that the Saudis could acquire nuclear weapons from Pakistan quickly if pressed by Iran's nuclear development.