This came just a few days after Saudi and Iran broke diplomatic ties following an attack on Saudi embassy in Tehran. According to Iranian government reports more than half a milllion people from Iran do make annual pilgrimage to Mecca. This generates alot of billions to Saudi Arabia inform of revenues.
Iran has also accused Saudi of purposely targeting the Iranian embassy in Yemen during their recent air strike. ALSO you can read Saudi Arabia gives Iranian diplomats 48 Hours to Leave the country
Saudi Arabia announced late on Sunday it was severing diplomatic relations with Iran after demonstrators stormed the Saudi embassy in Tehran. It gave Iranian diplomats 48 hours to leave.
It also recalled its diplomats from Tehran.
Iran's foreign ministry on Monday accused the Saudis of "continuing the policy of increasing tension and clashes in the region. Ministry spokesman Hossein Jaber Ansari said: "Saudi Arabia sees not only its interests but also its existence in pursuing crises and confrontations and attempts to resolve its internal problems by exporting them to the outside."