U.S. forces carried out additional strikes against Iranian targets on Saturday, responding to a one-way attack drone launched by Iran that struck a commercial tanker in the Strait of Hormuz, according to U.S. Central Command.

CENTCOM said in a statement that the strikes were conducted “in direct response to continued Iranian aggression against commercial shipping.” The command noted that after Friday’s U.S. strikes in retaliation for the Iranian attack on the M/V Ever Lovely, Iran was given an opportunity to uphold the ceasefire agreement but chose not to when its forces launched a drone that struck the M/T Kiku on Saturday morning.

Iranian state broadcaster IRIB reported explosions near the southern city of Sirik, citing a military source who said several projectiles struck a telecommunications tower in the area. IRIB also reported that projectiles targeted a village on Qeshm Island, which lies within the Strait of Hormuz. The reports could not be immediately independently verified.

The latest exchange further escalates tensions despite the interim memorandum of understanding reached between the U.S. and Iran last week, which established a 60-day negotiating period while both sides work toward a broader agreement. Vice President JD Vance warned on Friday that disputes over the framework should be resolved diplomatically. “Iran should pick up the phone” if disagreements arise over the agreement, Vance wrote on social media, adding that “violence will be met with violence.”

The Strait of Hormuz carries roughly one-fifth of the world’s seaborne oil, making it one of the globe’s most critical maritime chokepoints.