Hollywood heavyweights Sean Penn and Susan Sarandon are on hunger strike.

The pair are staging the protest in support of anti-war activist Cindy Sheehan, whose son Casey was killed in Iraq in 2004.

At a press conference in front of the White House, in Washington, Sheehan said: "Everything we do is to get the troops to come home. We want to show the world that there are Americans who are committed to peace. Fasting is such a time-honored way of protest."

Campaigner Sheehan will live on a diet of water, teas and juices until September 21 - International Peace Day.

Penn, Sarandon and a host of other stars, including "Lethal Weapon" actor Danny Glover and country music legend Willie Nelson, will take it in turns to abstain from food on set days in a "rolling program" of fasts.

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