The top UN official in Baghdad has urged the West to encourage Iraq's political groups to form a new government in line with the constitutional and help them overcome sectarian tension.

US Secretary of State John Kerry has said Iraqi Prime Minister Nuri al-Maliki told him he would meet a July 1 deadline to form a new inclusive government, but the blocs are divided over how to proceed after an election two months ago, faced with a war against Sunni militants.

At least a 1,000 people have been killed in fighting and other violence in Iraq in June alone as Sunni Islamists from the Islamic State in Iraq and Syria (ISIS) sweep through the north, the United Nations said on Tuesday.

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