Iranian Revolutionary Guard gunboats fired on a tanker transiting the Strait of Hormuz on Saturday morning, hours after Iran briefly reopened the waterway. Iran's military command then announced it was reimposing full control of the strait in response to the US maintaining its blockade of Iranian ports, reversing a temporary opening that followed ceasefire negotiations. The incident occurred as mediators worked to negotiate a broader agreement between the US and Iran before April 22 ceasefire deadline, with confusion over the strait's status threatening to deepen global energy markets and push both sides toward renewed conflict.