Unidentified “US officials” leak to Britain’s Guardian.

Iran is secretly forging ties with al-Qaida elements and Sunni Arab militias in Iraq in preparation for a summer showdown with coalition forces intended to tip a wavering US Congress into voting for full military withdrawal, US officials say.

“Iran is fighting a proxy war in Iraq and it’s a very dangerous course for them to be following. They are already committing daily acts of war against US and British forces,” a senior US official in Baghdad warned. “They [Iran] are behind a lot of high-profile attacks meant to undermine US will and British will, such as the rocket attacks on Basra palace and the Green Zone [in Baghdad]. The attacks are directed by the Revolutionary Guard who are connected right to the top [of the Iranian government]. …

US officials now say they have firm evidence that Tehran has switched tack as it senses a chance of victory in Iraq. In a parallel development, they say they also have proof that Iran has reversed its previous policy in Afghanistan and is now supporting and supplying the Taliban’s campaign against US, British and other Nato forces.

Tehran’s strategy to discredit the US surge and foment a decisive congressional revolt against Mr Bush is national in scope and not confined to the Shia south, its traditional sphere of influence, the senior official in Baghdad said. It included stepped-up coordination with Shia militias such as Moqtada al-Sadr’s Jaish al-Mahdi as well as Syrian-backed Sunni Arab groups and al-Qaida in Mesopotamia, he added. Iran was also expanding contacts across the board with paramilitary forces and political groups, including Kurdish parties such as the PUK, a US ally.