May 25 (UPI) — The United States launched strikes in southern Iran on Monday even as negotiators for Tehran and Washington were preparing for further talks to end their war, a U.S. military spokesman said.

Capt. Tim Hawkins of the U.S. Central Command said in a statement issued to media outlets that the strikes were “self-defensive” in nature and were carried out “to protect our troops from threats posed by Iranian forces.”

“Targets included missile launch sites and Iranian boats attempting to emplace mines,” Hawkins said. “U.S. Central Command continues to defend our forces while using restraint during the ongoing cease-fire.”

The semi-official Mehr News Agency in Iran reported that “several explosions” were heard in the area of Bandar Abbas along the Strait of Hormuz and that civil defense sirens had been sounding there.

The agency said the situation in the city “is completely under control and there is no reason for any concern for the honorable people of Bandar Abbas.”

The announcement of new strikes came only hours after U.S. President Donald Trump wrote on his Truth Social platform that negotiations with Iran were “proceeding nicely,” but also issued a warning that the war could reignite if an agreement isn’t reached.

Iran, meanwhile, confirmed some progress had been made but cautioned that no agreement was on the verge of being signed.

Tehran’s lead negotiator, Parliament Speaker Mohammad Ghalibaf, and Foreign Minister Seyed Abbas Araghchi arrived in Doha for the talks, the semi-official Fars News Agency reported.

The renewed attacks came on the heels of Secretary of State Marco Rubio signaling to reporters while in India that an agreement appeared on the horizon before walking it back hours later.

Rubio had said that the president may have an update on negotiations but later walked that back, saying the agreement was “still a work in progress.”

The United States is seeking to have Iran reopen the important Strait of Hormuz energy route. After that is achieved, negotiations will entered the next phase focused on ending the war.