India, Aug. 31 -- A day after the Delhi Zoo recorded deaths of two painted storks by avian influenza (bird flu), two more birds - black-headed ibis - who died on Thursday also tested positive for the flu on Saturday, zoo officials said.

"The two black-headed ibis died on Thursday and samples were sent to National Institute for High Security Animal Diseases (NIHSAD), Bhopal. The reports are back and they have tested positive for H5N1 avian influenza virus," an official said.

After the storks tested positive for bird flu on Friday, the zoo authorities had announced a temporary closure of the premises for the public.

A statement released by zoo director Sanjeet Kumar on Friday had mentioned that immediate action had been initiated in acco...