Iranian Revolutionary Guards seized a foreign oil tanker in the Gulf that was smuggling fuel and detained seven crewmen, Iran’s state media reported on Sunday, in a show of power amid heightened tension with the West.

The vessel was intercepted near Iran’s Farsi Island in the Gulf, Iran’s semi-official Fars news agency said. The elite Revolutionary Guards Corps (IRGC) has a navy base on Farsi island which is located north of the Strait of Hormuz.

Fars and Lebanon’s al-Mayadeen TV station reported that the tanker was seized on Wednesday.