Health officials in Turkey say a girl who has has died in the eastern region of Turkey is suspected to have had bird flu.
They are waiting further confirmation that the teenage girl, from the same area where the virus has already killed three siblings, had the deadly virus.
If this is the case, her death will bring the number of deaths in Turkey this month to four.
Huseyin Avni Sahin, chief doctor at Van University hospital, is expected to make a full statement regarding her death.
The H5N1 virus has been found in wild birds and poultry across large parts of Turkey, particularly in poor villages stretching from Istanbul to Van near the Iranian and Iraqi borders.
The girl's brother is apparently also in Van hospital suffering from bird flu-like symptoms and is in a critical condition.
The children were reportedly taken to Van hospital after being in contact with sick chickens.
They were treated with the antiviral Tamiflu.
According to the World Health Organisation (WHO), the victims have all contracted the disease from close contact with infected poultry; some of the children are said to have been playing with birds or helping kill them for food or sale.
The deaths in Turkey are the first human cases reported outside east Asia since H5N1 re-emerged in 2003.
Although the virus remains essentially a bird disease, it has infected as many as 150 people and killed at least 78.
WHO doctors say there is no evidence of human-to-human transmission in the Turkish cases.
The WHO also says that of the dozen bird flu patients still in hospital most are not in a critical condition but are still receiving treatment.
Three people have recovered and were released from hospital last week.
It is reported that two more children, aged 11 and 13, have been hospitalised in Istanbul with bird flu-like symptoms after coming into contact with chickens in the town of Gebze.
It is unclear whether the children have been tested for bird flu.