Oil prices soared more than four percent Friday following news that the US had killed a top Iranian general, fanning fresh fears of a conflict in the crude-rich region. The head of Iran’s Quds Force, Qasem Soleimani, was hit in an attack on Baghdad’s international airport early Friday, according to Hased, a powerful Iraqi paramilitary force linked to Tehran. Later, Donald Trump tweeted a picture of the American flag, and the Pentagon said he had ordered Soleimani’s killing.