Iran’s Islamic Revolutionary Guard Corps (IRGC) said Thursday that two oil tankers and a tugboat caught fire in separate incidents after vessels attempted to use routes it deemed unauthorized through the Strait of Hormuz. The IRGC said a large tanker struck a mine south of the strait on Wednesday night, caught fire and stopped, while another supertanker caught fire while leaving a route in the waterway’s eastern section. A tugboat approaching to help extinguish that blaze also caught fire. The IRGC said its naval electronic-warfare unit had taken control of two Lucas-type aircraft it described as intruding, and claimed its navy remained in control of the strait. It accused the United States of encouraging vessels to use a mined route, warning that resulting damage would raise insurance costs for U.S. taxpayers and regional allies and create further financial and political losses for Washington. The strait, between Iran and Oman, carries significant oil and gas exports from Gulf countries to international markets. The incidents come amid renewed fighting between Washington and Tehran after a ceasefire in April; the conflict resumed in July following stalled diplomatic efforts.