dubai, April 21 -- The Strait of Hormuz now appears to be just as closed as before Iran and the US said the vital oil channel had been reopened. Traffic through the strait on Sunday and Monday was reduced to a trickle after Tehran rejected a continuing US naval blockade and moved to seal the waterway again. The reduced movement underscores just how quickly hopes unravelled that cargoes could once again resume. On Friday, Iran's Foreign Minister Abbas Araghchi said the strait was "completely open" for commercial shipping, while US President Donald Trump said Iran was removing sea mines from the waterway. That prompted oil prices to plunge and dozens of tankers to race towards the strait at the mouth of the Persian Gulf. But Iran quickly decl...