An Iranian child carrries a photograph Sunday of a relative killed in the war in Tehran, Iran. On Monday, Iran said Monday's attacks on Iran violated a cease-fire. Photo by Behnam Tofighi/UPI | License Photo

May 26 (UPI) -- Iran said the U.S. strikes on Iran Monday were a "gross violation" of the fragile cease-fire between the two countries that began on April 8.

"The United States committed a gross violation of the ceasefire in the Hormozgan region in the past 48 hours. ... Iran holds the U.S. regime responsible for all the consequences resulting from these aggressive and unjustified actions," the Iranian Foreign Ministry said in a statement Tuesday.

Gen. Seyed Majid Mousavi, commander of the Islamic Revolutionary Guard Corps Aerospace Force, said on X: "Negotiation with the enemy is pure loss. ... The treacherous enemy has once again violated the cease-fire during the time of negotiations. The Aerospace Force of the IRGC is prepared for a decisive, swift response and the implementation of measures ordered by the esteemed Commander-in-Chief."

A statement posted on X attributed to Iranian Supreme Leader Ayatollah Mojtaba Khamenei warned the U.S. and its allies of renewed attacks, The Hill reported.