6,644 are still missing after Katrina; toll may rise

From the article:

...Those counting the victims are particularly concerned about an estimated 1,300 unaccounted-for people who lived in areas that were heavily damaged by Katrina, or who were disabled at the time the storm hit. The fact that authorities haven't been able to determine what happened to them suggests that the death toll from Katrina could climb significantly...

Nearly 1,000 of the 6,644 unaccounted-for people are children. Ernie Allen, president of the National Center for Missing & Exploited Children, says volunteers continue to go door to door to try to close missing-person cases.