Iran seized a second oil tanker in a week on Wednesday in the Persian Gulf, and the U.S. State Department called for its release.

The Bahrain-based Fifth Fleet of the U.S. Navy said the Panama-flagged oil tanker Niovi was seized by Iran's Islamic Revolutionary Guard Corps Navy (IRGCN) at 6:20 a.m. (0220 GMT) while passing through the Strait of Hormuz.

In Iran's first response, Tehran's prosecutor announced the oil tanker was seized on a judicial order following a complaint by a plaintiff, the judiciary's Mizan news agency said. No further details were provided.

The incident comes after Iran seized a Marshall Islands-flagged oil tanker in the Gulf of Oman known as the Advantage Sweet last week. That tanker is being held by Iranian authorities in Bandar Abbas, the Marshall Islands flag registry said on Tuesday.

Maritime security firm Ambrey has said it believed the Advantage Sweet's seizure was in response to a recent seizure via a court order by the United States of an oil cargo aboard the Marshall Islands tanker Suez Rajan.

The Niovi oil tanker seized on Wednesday had been travelling from Dubai toward the UAE's Fujairah port when it was forced by IRGCN boats to change course towards Iranian territorial waters, the Navy said.

About a fifth of the world's crude oil and oil products passes through the Strait of Hormuz, a choke point between Iran and Oman, according to data from analytics firm Vortexa.