Health officials in Turkey say a third child of the same family has died of bird flu in the eastern Turkish city of Van.
Doctors say the 11-year-old girl, Hulya Kocyigit died Friday. Her 14-year-old brother died Sunday, and her 15-year-old sister died Thursday.
Health officials say that some 25 people in Turkey - mostly children - are being treated for possible bird flu.
The World Health Organization is investigating the outbreak - the first one among humans outside east Asia. A spokeswoman in Geneva says there is no evidence of human-to-human transmission, but said the development foreshadows a global pandemic.
Authorities in neighboring Azerbaijan are testing dead birds in the southern part of the country for signs of bird flu.
Meanwhile, Indonesia says it has budgeted $940 million to fight bird flu over the next two years.