Indian shares are expected to open lower on Thursday, extending the previous session's losses as oil prices soar due to reports of fresh attacks on ships in the Strait of Hormuz and Iraqi waters. The International Energy Agency's plan to release 400 million barrels from its reserves and a pledge from the U.S. for 172 million barrels also failed to impress. The Middle East conflict has kept investors wary of its impact on inflation and global oil supplies.