Iran launched a drone attack on a cargo ship in the Strait of Hormuz on Thursday, days after signing a peace agreement with the United States. The strike forced the United Nations to suspend its rescue operation for thousands of stranded sailors and hundreds of ships in the Persian Gulf. A US official confirmed the attack to CNN, while Iran has not officially claimed responsibility. The incident occurred shortly after Iran’s Revolutionary Guards warned against using unauthorized routes through the waterway.

The International Maritime Organization (IMO) said it paused its evacuation mission, which had been underway to relocate over 11,000 sailors since the war began. IMO Secretary-General Arsenio Domingo stated that safety must come first and the mission will remain suspended until conditions are clarified. The attacked vessel was not part of the IMO’s rescue framework. The strike also pushed global oil prices up by 2 percent to $74 per barrel.

The attack has cast uncertainty over the recently signed 60-day tariff-free maritime agreement between Washington and Tehran, which aimed to reopen the strait and ease economic sanctions while deferring nuclear discussions to later technical talks.