Man carries chicken as young boy looks by at market in East Java, Indonesia

Indonesia's health ministry say local tests indicate two more siblings have died of bird flu in the country.

Health officials say the 18-year-old boy and 10-year-old girl died Tuesday at a hospital in West Java province.

Indonesia is already grappling with a separate bird flu case involving the largest family cluster ever reported.

World Health Organization scientists are investigating the bird flu deaths of seven members of a family from Sumatra island who may have infected each other. But, the scientists say there is no evidence of more widespread human-to-human transmission.

The scientists also have no plans to issue a pandemic alert.

The WHO has so far confirmed 33 cases of bird flu deaths in Indonesia.