SINGAPORE/LONDON, April 15 -- The first full day of a US blockade on vessels calling at Iranian ports made little difference to Strait of Hormuz traffic on Tuesday, with at least eight ships including three Iran-linked tankers, crossing the waterway, shipping data showed. US President Donald Trump announced the blockade on Sunday after weekend peace talks in Islamabad between the US and Iran failed to reach a deal. The blockade has created even further uncertainty for shippers, oil companies and war risk insurers. Traffic remains at only a fraction of the 130-plus daily crossings before the U.S. and Israel's war on Iran began on February 28, industry sources said on Tuesday. "During the first 24 hours, no ships made it past the US blockade,...