Repercussions from a missile attack on Saudi Arabia on Saturday continue, as Riyadh has decided to get tougher with Yemeni Houthi rebels and Iran, whom Saudi Arabia accuses of interference in Yemen.
Saudi Foreign Minister Adel al-Jubeir said on Monday his country reserves the right to respond to Iran's "hostile actions". Houthi rebels have fired missile at Saudi targets a number of times, but the latest missile targeted Riyadh itself.
Jubeir also said on his Twitter account that Iranian interference in the region harms neighboring countries and international peace and security.
The Saudi-led military coalition also announced the closure of all air, land and sea ports to Yemen to prevent arms reaching the Houthi rebels. Reports indicate that flights have already been halted.
Although the coalition said it will be considerate towards humanitarian needs, the already serious shortages of food and medication are expected to get worse in Yemen.
The Saudi-led coalition has already been criticized by the U.N. and humanitarian organizations for restricting aid to the war-torn country.
Iran rejected Saudi accusations on Monday. The foreign ministry spokesman said the Saudis are guilty of "aggression" and "war crimes", and reaction by Yemenis is an independent reaction.
U.S. president Donald Trump has also blamed Iran for the missile attack.