Iran live updates: Tehran has 'no plans' for new round of talks, spokesperson says

The spokesperson for Iran's joint military command at Khatam al-Anbiya Central Headquarters said Monday that if the security of Iranian ports in the Persian Gulf and the Sea of Oman is threatened, "no port in the Persian Gulf and the Sea of Oman will be safe."

"Enemy-affiliated" vessels will not have the right to pass through the Strait of Hormuz, while other vessels will continue to be allowed transit "in accordance with the regulations of the Islamic Republic of Iran's armed forces," the spokesperson said, as quoted by Iran's state television Telegram channel.

"Given the continued threats," he said, the Islamic Republic will also implement "a permanent mechanism" to control the Strait of Hormuz, even after the war.

The price of oil again climbed on Monday, after the United States said it would begin a blockade of the Strait of Hormuz.

The blockade -- which was expected to begin at 10 a.m. ET, according to U.S. Central Command -- appeared poised to continue the disruption of the vital maritime passageway off the southern Iranian coast, through which some 20% of the world's oil supply is shipped.

Brent crude oil prices, a benchmark for global trading, climbed about 8% by 5 a.m. ET on Monday. It traded at more than $102 a barrel for deliveries in June.

U.S. crude prices for May contracts also advanced about 8% in early trading, climbing to about $103 per barrel.