Iran vowed on Saturday not to let an attack on one of its oil tankers off the coast of
Saudi Arabia to go unanswered, the semi-official ISNA news agency reported.
Ali Shamkhani, secretary of the Supreme National Security Council, said clues had been uncovered as to who was behind what he called a "missile attack" on the Sabiti tanker.
"Maritime piracy and wickedness in international waterways... will not be left unanswered," he said, quoted by ISNA.