Dhaka, March 21 -- Global shares slumped for a third straight session and were poised for a third consecutive weekly decline on Friday, while bond yields climbed on fears the Iran war would keep upward pressure on oil prices and spark inflation.

Iran attacked an oil refinery in Kuwait on Friday and Israel killed a spokesman of Iran's Revolutionary Guards, while three US officials told Reuters that thousands of additional US troops will be deployed to the Middle East.

Iraq declared force majeure on all oilfields developed by foreign oil companies, as military operations in the region have disrupted navigation through the Strait of Hormuz, preventing most of the country's crude exports from moving, oil ministry sources said.

On Wall Stre...