January 2 - 47 alleged terrorists are executed by the Saudi state, including leader of the anti-government Shia movement, Sheikh Nimr al-Nimr.[1][2]
January 2 - The embassy of Saudi Arabia in Tehran, Iran, is ransacked and set on fire by protesters against al-Nimr's execution.[3]
January 3 - Saudi Arabia breaks off diplomatic relations with Iran after the events that happened on January 2.[4]
January 4 - Saudi Arabia announces it will end all air traffic and trade links with Iran, demanding Iran to "act like a normal country" before severed diplomatic relations can be restored.[5]