REUTERS
Iran has banned all imports from Saudi Arabia and told Iranians they can't join pilgrimages to its holy cities of Mecca and Medina, according to CNN.
The announcement Thursday follows Saudi Arabia's decision to break off diplomatic and economic ties with Iran after its embassy in Tehran was attacked, CNN reports.
Saudi Arabia doesn't rank among Iran's top trading partners but the ban on pilgrimages could hurt: it makes around $18 billion a year from religious tourism, and Iranians comprise one of the biggest groups of visitors.
Officials estimate around 600,000 Iranians travel to Saudi Arabia every year to perform pilgrimages. Some flights between the two countries have already been suspended.
The latest spike in tension between the regional rivals began at the weekend when Saudi Arabia said it had executed an outspoken Shiite cleric and a critic of the Saudi royal family. The execution triggered the angry demonstrations at the Saudi embassy.
Saudi Arabia immediately cut diplomatic ties with Iran. Bahrain and Sudan followed suit, while Kuwait and Qatar recalled their ambassadors to Tehran. The United Arab Emirates also officially downgraded its diplomatic relations with Iran.