The Muslim pilgrims’ road to the holy city of Karbala became a highway of bullets and bombs for Shiites yesterday. Drive-by shootings and roadside and bus bombs killed or wounded 19 people, ratcheting up the sectarian tensions gripping Iraq.

Heliborne US and Iraqi troops pressed their sweep through a 100-square-mile section of central Iraq today in a bid to break up a centre of insurgent resistance, the US military said. No casualties were reported on either side.

On the day of the first session of Iraq’s new parliament today, and within days of the third anniversary of the US-led invasion, the country lie under the shadow of a feared civil war and politicians report a stalemate over the next government.