The recording, published by the Iranian Tasnim News Agency on Monday, appears to contain brief excerpts from the radio exchanges between IRGC patrol boats and a British warship, which occurred during two separate incidents near the Strait of Hormuz earlier this month.

Tensions between Tehran and London escalated on July 4 after British Royal Marines seized Iranian supertanker Grace 1, off the southern coast of Spain, which was suspected of transporting oil to Syria in violation of EU sanctions. Iran denied any wrongdoing.

On July 11, the British government said its frigate HMS Montrose was forced to intervene to prevent three Iranian boats from blocking the path of UK-flagged oil tanker British Heritage. The IRGC denied this claim, saying they had “no encounters” with foreign ships that day.

In the audio, however, an IRGC officer can be heard warning a British ship, referred to as F-236 in the recording, which is Montrose’s hull number.

“The tanker British Heritage is under my control. You are ordered: do not interfere in my operation,” the Iranian officer says, according to the audio.