Iran’s joint military command has warned that all oil tankers moving through the Strait of Hormuz must use its approved routes or face a “forceful response.” The statement from the Khatam al-Anbiya military command was aired on Iranian state television Thursday. It wasn’t immediately clear what sparked the threat from Iran. Ship passage through the vital waterway is continuing to rebound, even after Iran attacked two commercial vessels last week that circumvented its routes. Shipping data firm Lloyd's List Intelligence says at least 258 ships transited the strait last week, a period that includes the Iranian strikes. That's up from 138 ships the previous week.