The May 12 polls are the first to be held since Iraqi Prime Minister Haider Al-Abadi declared victory over the jihadists in December.
It had previously pledged to disrupt Saturday's election, the first since it lost Mosul and other parts of Iraq previous year to government forces supported by a Western coalition and pro-Iranian militias.
The Iraqi air force has since past year carried out a number of strikes against the militant group in Syria, with the approval of the Syrian regime of President Bashar Al Assad and the US-led coalition fighting ISIS.
Previously a carrier-based USA group led by the aircraft carrier Harry S. Truman began strikes on the positions of the terrorist organization "Islamic state" in Syria.
"After receiving information on the target in co-operation with Syria's government and in co-ordination with coalition forces, F-16s from the Iraqi air force led strikes against a command post of IS, 10 kilometres from the Iraqi border inside Syria", said General Mohammed al-Askari, an adviser to Iraq's defence ministry.
The security situation in Iraq has been dramatically improved after Iraqi security forces fully defeated the extremist Islamic State (IS) militants across the country late in 2017. In a statement on the messaging app Telegram, the militant group said Juburi was killed because he was "an atheist". Daesh, which had launched a sweeping offensive in 2014 and at one point controlled one third of Iraq, still holds pockets of desert along the border with Syria.