Turkish port authorities have started informally requesting shipping agents to provide written guarantees that vessels are not connected to Israel and are not carrying military or hazardous cargo destined for the country, according to shipping industry sources. The instructions, reportedly given verbally by the harbor master's office, apply to ports throughout Turkiye, but no official circular has been issued. These guarantee letters must confirm that vessel owners, managers, and operators have no ties to Israel and that prohibited cargo such as explosives, radioactive materials, or military equipment is not on board for Israel. The transport ministry has not commented on the matter. This development follows Turkiye's decision last year to cut trade with Israel in response to the conflict in Gaza.