The United States carries out another round of strikes against Iran on Wednesday, hours after President Donald Trump announces that the ceasefire between the two countries is over. Multiple reports describe the attacks as following what Trump says were Iranian actions involving ships in the Strait of Hormuz, which he presents as signaling the end of the fragile agreement.

Sources also link the new strikes to a recent U.S. operation carried out the day before, when U.S. forces targeted a range of military sites and port facilities in response to Iran’s alleged targeting of merchant vessels off the coast of Oman.

According to Iranian state media, explosions occur in several locations, including the southern port cities of Bandar Abbas and Sirik, and Bushehr, where Iran’s nuclear power plant complex is located. Reporting from military officials indicates the purpose of the latest attacks is to further degrade Iran’s ability to threaten freedom of navigation in the Strait of Hormuz. Several outlets note concerns that the strikes could trigger fears of wider conflict resuming.