The Iranian Navy claimed Monday that another oil tanker had caught on fire after striking a sea mine near the eastern entrance to the Strait of Hormuz, according to the Fars News Agency, which is closely linked with Iran's powerful Islamic Revolutionary Guard Corps.

The report cited the Navy as saying the unnamed vessel had struck a mine while attempting to use shipping lanes through the strait that Iran considers unauthorized and unsafe, but which the Trump administration and U.S. military have repeatedly claimed are free and open.

The tanker had switched off its navigation systems, Fars said, referring to a common practi...