The Islamic Revolutionary Guards Corps of Iran has detained a foreign oil tanker it said had been smuggling fuel, Iranian news media reported on Thursday, days after a United Arab Emirates vessel with the same name disappeared in the Persian Gulf.

The disclosure raised tensions in the running conflict that has pitted Iran against some of its regional neighbors and the United States.

Several state news organizations in Iran reported the seizure of the tanker, based on a statement from the Revolutionary Guards, which claimed that the ship had been carrying one million liters of contraband fuel. The Iranian state news agency Al Alam reported that the Revolutionary Guards detained the ship on Sunday.

The Revolutionary Guards statement said the incident took place to the south of Iran’s Larak Island, in the northern part of the Strait of Hormuz, the narrow Persian Gulf waterway that is a vital conduit for maritime petroleum traffic.