dubai, April 24 -- Traffic through the Strait of Hormuz remains largely frozen, with only occasional movements of Iran-linked vessels breaking the lull. As of Thursday morning, only one Iran-linked bulk carrier was observed making the transit out of the Persian Gulf, according to vessel-tracking data compiled by Bloomberg. Security risks in the waterway escalated on Wednesday after Iranian gunboats opened fire on commercial ships, while the US blocked two of Tehran's oil tankers. The standoff has deepened as the US military said it intercepted two Iranian oil supertankers attempting to evade a US blockade outside the Persian Gulf, underscoring Washington's push to constrain Tehran's shipping. The action comes in the wake of Wednesday's host...