TULSA, Okla. (AP) - Several children are on dialysis after a severe intestinal illness in northeastern Oklahoma that may be related to E. coli bacteria.

Dr. William Banner at Children's Hospital at St. Francis says three children aged 18-months to 12-years are undergoing dialysis and a 15-year-old may soon need the treatment.

Banner says two other children were sent to an Oklahoma City hospital for similar treatment.

The illness has killed 26-year-old old Chad Ingle.

State health officials are trying to identify the source of the outbreak and whether it's related to E. coli.

They have confirmed many of those sick ate at the Country Cottage restaurant in Locust Grove but say it's too early to pinpoint the restaurant as the source.

(Copyright 2008 by The Associated Press. All Rights Reserved.)