Iran’s Khatam al-Anbia Central Headquarters announced the closure of the Strait of Hormuz to all vessel traffic following U.S. strikes on southern Iran.

The closure applies to all vessels, including oil tankers and commercial ships. Iranian officials warned that any movement through the waterway will be affected and said that anyone attempting to transit the strait could be targeted.

The announcement comes despite previous Iranian statements over the past two months asserting control over traffic through the Strait of Hormuz, leaving unclear what practical changes, if any, this latest declaration entails.