(CBS NEWS) BAGHDAD — Islamic militants overran parts of Iraq’s second-largest city of Mosul on Tuesday, driving security forces from their posts and seizing the provincial government headquarters, security bases and other key buildings. Gunmen cruised through neighborhoods, waving black banners while residents fled.

Prime Minister Nouri al-Maliki pressed parliament to declare a state of emergency.

The fight for Mosul was a heavy defeat in Baghdad’s battle against a widening insurgency by a breakaway al Qaeda group, the Islamic State of Iraq and the Levant, which has been trying – with some success – to seize territory both in Iraq and neighboring Syria.

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