A roadside bomb has struck a passenger bus, killing seven civilians and wounding more than a dozen others in southern Afghanistan, officials say.

Three children and one woman were among the dead in Tuesday's attack, police said.

The bus was driving from the main southern city of Kandahar to the Afghan capital Kabul when it hit the bomb in Muqoor district of Ghazni province, a flashpoint in a 12-year Taliban insurgency.

Seventeen people were also injured in bomb attack.

Baz Mohammad Emat, director of Ghazni central hospital, said that some of the wounded people were in a critical condition.

There was no claim of responsibility for the attack, but the Afghan Interior Ministry blamed the Taliban, who have been waging a violent anti-government campaign since their regime was toppled in late 2001.

Source: Agencies