The U.S. Navy said Iran seized a Marshall Islands-flagged oil tanker in the Gulf of Oman on Thursday amid wider tensions over Tehran’s nuclear program. The Navy’s Mideast-based 5th Fleet identified the vessel as the Advantage Sweet. Satellite tracking data for the vessel from MarineTraffic.com showed it in the Gulf of Oman just north of Oman’s capital, Muscat, on Thursday afternoon. It had just come from Kuwait and listed its destination as Houston, Texas.