U.S. Secretary of State John Kerry landed in Baghdad on Monday to press Prime Minister Nuri al-Maliki to form a more inclusive government in response to a Sunni insurgency that has swept much of northern and western Iraq.

Kerry's visit came after Sunni militants took strongholds along Iraq's western border at the weekend, strengthening supply routes from Syria where they have exploited a three-year-old rebellion to capture swathes of territory.