A bomb exploded Wednesday outside a home in southwestern Baghdad, killing a woman and her two children, as other bombings killed at least seven Iraqi security personnel and a local politician in the capital and a volatile northern area.

The blast outside the home of Mohammed Ali Wais in the Baghdad neighborhood of Radwaniyah killed his wife and two children. Wais, who was unharmed, is a friend of a hard-line Sunni leader who has been accused of supporting insurgents in Iraq. A month earlier, Wais' brother, a professor at a university in western Iraq, was killed.

A police official, who spoke about the bombing on condition of anonymity because he is not an official spokesman, did not have information on a possible motive.

Wais is a friend of Harith al-Dhari, leader of the Sunni Association of Muslim Scholars, which some government officials have accused of supporting al-Qaida in Iraq.

The U.S. has accused al-Dhari, who is believed to be living in Jordan, of ordering the kidnappings of foreigners and directing an October 2006 plot to bring bombs into Baghdad's fortified Green Zone as part of an effort to assassinate the commander of U.S. forces in Iraq and the U.S. and British ambassadors.

A medical official at Abu Ghraib hospital confirmed that the blast killed a woman and two children who were 9 and 13 years old.

Though violence has eased across Iraq overall, attacks have persisted in Baghdad and the restive city of Mosul in northern Iraq.

Roadside bombings in Baghdad and in an around Mosul killed a policeman and six Iraqi soldiers on Wednesday, police said. A bomb attached to a car also killed a city council member in Baghdad's western outskirts.