Seven of the most important Sunni-led insurgent organisations fighting the US occupation in Iraq have agreed to form a public political alliance with the aim of preparing for negotiations in advance of an American withdrawal, their leaders have told the Guardian.

In their first interview with the western media since the US-British invasion of 2003, leaders of three of the insurgent groups - responsible for thousands of attacks against US and Iraqi armed forces and police - made clear that they would continue their armed resistance until all foreign troops were withdrawn from Iraq, and denounced al-Qaida for sectarian killings and suicide bombings against civilians.

Insurgents form political front to plan for US pullout