A top Islamic State group commander, Omar al-Shishani, has been killed in Iraq, the jihadist-linked Amaq agency said on Wednesday. The Pentagon announced in March that Shishani, known as Omar the Chechen, was believed to have died of injuries received in an air raid targeting his convoy in northeastern Syria -- details at odds with Amaq's account. Citing a "military source," Amaq said Shishani was killed "in the town of Sharqat as he took part in repelling the military campaign on the city of Mosul", referring to the last IS-held city in Iraq.