Iraq: Bombers attack religious pilgrimage three days in a row

Do I even have to say "guess who?" at this point?

Bombers struck Shiite pilgrims Saturday for a third consecutive day, killing six people in the latest in a series of attacks apparently aimed at stoking sectarian tension.

The attacks have targeted pilgrims headed for the Shiite city of Karbala, where hundreds of thousands of people have gathered for festivities that culminate Sunday morning.

No group has claimed responsibility, but assaults on Shiite civilians have been carried out for years by Sunni extremists such as al-Qaida in Iraq.