ilitary Revolutionary Guard. Those boats have been key in harassing ships in the strait.

The U.S. military remains  postured and prepared to hold Iran accountable when the agreement is not adhered to or obeyed,  it added, saying this round of attacks had ended.

Iran acknowledged the strikes, but offered no word on any losses. Iranian state media reported the sound of explosions in Bandar Abbas, Qeshm and Sirik.

Iran's central military command warned it  will respond decisively to this aggression and terrorist act. 

 Under no circumstances will (the Iranian armed forces) allow interference in the affairs of the Strait of Hormuz, nor will they permit others to manage it,  it said.

A similar spate of Iranian attacks on shipping and U.S. retaliatory strikes occurred late last month - which similarly drew Iranian attacks on Bahrain and Kuwait. Wednesday's strikes also came as Trump was in Turkey for a summit of the NATO military alliance.

US revokes license for the sale of Iranian oil

The U.S. also revoked a license that authorized the sale of Iranian oil as part of the interim deal. That had allowed Iran for the first time in years to conduct oil sales openly on the international market for U.S. dollars. Iran long had been suspected of selling sanctioned crude oil at below-market prices to China.

The decision came after the strikes on shipping. One tanker was traveling off the coast of Oman when it was hit and caught fire, the United Kingdom Maritime Trade Operations center said. Iranian state television said the liquefied natural gas tanker came under attack after ignoring warnings but did not directly claim the assault.

The other two ships sustained some damage, but no one was injured, and both continued on their way in the Strait of Hormuz, the U.K. maritime agency said. Iran has maintained a chokehold on the Strait of Hormuz since the war, disrupting global energy markets as a fifth of all traded oil and natural gas passed through the channel in peacetime. The ships attacked Tuesday all appeared to be using a route close to Oman's shore, rather than one ordered by Tehran.

Tehran repeatedly has declared that only its approved route through the strait is safe and is suspected of attacking other ships that have used the Oman route.

Majed al-Ansari, a spokesperson for the Qatari Foreign Ministry, said the Qatari tanker Al Rekayyat was targeted in an  unacceptable attack  on international navigation and global energy security. He said Qatar holds Iran  fully legally responsible. 

Iran and the United States agreed as part of the interim deal to allow ships to pass without paying charges for 60 days. But Tehran insisted it must control the vessels' routes and later charge fees for passage, which would upend decades of practice in the waterway.

The U.S. and many Gulf Arab states say they will not agree to Iran charging for passage through the strait.