Iran's Revolutionary Guard navy on Saturday warned that any attack on Iranian oil tankers or commercial vessels would be met with a “heavy assault” on one of the U.S. bases in the region and enemy ships, even as a tenuous ceasefire appeared to be holding. DUBAI, United Arab Emirates (AP) — Iran's Revolutionary Guard navy on Saturday warned that any attack on Iranian oil tankers or commercial vessels would be met with a "heavy assault" on one of the U.S. bases in the region and enemy ships, even as a t... [4882 chars]