U.S. lays blame squarely on Iran for oil tanker attacks Tensions are high in one of the world’s most strategic regions, after attacks on two tankers near the Persian Gulf. The U.S. claims Iran carried out the suspected attack on the Japanese and Norwegian owned ships. Iran’s foreign minister denies it, calling the accusations part of a plot. The U.S. points to a video that U.S. officials say shows Iran removing evidence from one of the tankers. David Martin reports.