Global oil prices are on the rise again after President Donald Trump declared the ceasefire agreement with Iran “over.”

Stock indexes were mostly rising in premarket trading on Wall Street Wednesday and oil prices rose modestly after Iran threatened to block Middle East energy exports in retaliation for the U.S. resuming its blockade of Iranian ports.

Oil prices rose and U.S. stock-index futures slipped on Sunday, after the U.S. and Iran continued their tit-for-tat attacks around the Strait of Hormuz over the weekend.

For decades, OPEC influenced the market by how much oil it produced. But China, the largest importer, is demonstrating its remarkable power over prices.

Stock futures pointed in different directions Tuesday as rising energy prices, bank earnings, and key inflation data competed for investor attention

By Ishaan Arora and Emily Chow SINGAPORE, July 14 (Reuters) - Oil prices rose nearly 3% on Tuesday to their highest in four weeks, as the U.S. reimposed its naval blockade of Iran while the two countries stepped up attacks in the Strait of Hormuz,

Stocks fall and oil prices rally, while government bond yields rise, after US and Iranian forces renewed exchanges of heavy missile and drone assaults, with Tehran saying it had again closed the vital Strait of Hormuz.

A large oil tanker moves through the Strait of Hormuz as a smaller Iran-flagged speedboat cuts across the foreground. Iran said Monday that the Strait of Hormuz remained closed after U.S. and Iranian forces exchanged heavy missile,