Iran's government says seven oil tankers have caught fire or were been damaged in the strategic Strait of Hormuz. This comes amid rising tensions over the prospect of a return to all-out war. Iranian state television cites the Revolutionary Guard Corps navy, which threatens to strike U.S. military bases if the United States continues guiding commercial ships through the strait. The U.S. is meanwhile sending more military assets to the region. Mediators are trying to bring Washington and Tehran back to talks. Iran has proposed ending the conflict if the U.S. meets certain conditions, but President Donald Trump rejected it, though discussions have continued.