Iran has seized a Panama-flagged oil tanker in the Strait of Hormuz, the second such capture by Tehran in recent days. That's according to the U.S. Navy. The Mideast-based 5th Fleet identified the vessel taken as the Niovi. It said Iran’s paramilitary Revolutionary Guard seized the ship on Wednesday. The Navy published pictures of small Guard vessels surrounding the tanker. Iran’s state-run IRNA news agency acknowledged that the Guard seized the vessel, but offered no motive. Last week, Iran seized an oil tanker carrying crude for Chevron amid wider tensions between Tehran and the United States over its nuclear program.