An oil tanker belonging to an Emirati company was reported detained near Iran's Qeshm Island while crossing the Strait of Hormuz, according to Iran's semi-official Fars News Agency. Fars cited maritime navigation data but did not identify the tanker or its owner, and no official Iranian or Emirati statement had appeared by 1700 GMT. The report added to concern over possible disruptions to shipping through the strategic oil transit route and helped push Brent crude toward $91 a barrel on Monday. In broader markets, long-dated U.S. Treasury yields also rose, with the 30-year yield reaching 5.31% and the 10-year yield at 4.725%, as investors assessed geopolitical risk and market pressure.