The British House of Commons was suspended after purple powders were thrown from the public gallery towards Prime Minister Tony Blair during his speech on Wednesday.

Fathers 4 Justice, a group which campaigns for fathers denied access to their children, claimed responsibility for targeting the prime minister dispelling fears of a terrorist attack.

The incident led to the parliamentary session being suspended and the building evacuated.

Police confirmed that two men were arrested in the wake of the incident and that no-one was injured.

A spokesman for the father's rights group said the two men made their protest in the run-up to Father's Day on June 20, aimed at demanding equal rights for fathers.

The group, which often seeks publicity through high-profile stunts, said the purple powder, later found to be colored flour, was used because purple is the international color of equality.

The powder appeared to have come from protestors sitting in a section of the gallery normally reserved for guests of members of parliament.

The incident is embarrassing to the parliament's security department given that a massive 600,000 pound (1.08 million US dollar) security screen was recently installed in the public gallery to prevent such incidents.

Peter Hain, the leader of the House of Commons, warned last month that terrorists might attack parliament with biological weapons or deadly gas.

Source: Xinhua