Health workers in eastern India battled Friday to contain an "alarming" outbreak of bird flu amid reports the virus had spread to new areas and local people were resisting a mass poultry cull.
State officials in densely-populated West Bengal said chickens were still on sale despite a ban, while New Delhi called in troops to prevent birds being smuggled out.
The state's chief minister Buddhadeb Bhattacharjee described the spread of the virus as "alarming".
The minister told the Press Trust of India (PTI) his government had upped the cull target to 400,000 poultry, adding that the Rampurhat sub-division of Birbhum district was the worst affected.
He added that poultry in a five to 10 kilometre (three to six mile) radius of the affected areas would be culled and that it would take seven days.
"We have decided to increase the strength of the culling teams," Bhattacharjee said after culling got off to a slow start Wednesday.
Some 30 million rupees (770,000 dollars) had been set aside to compensate poultry owners.
The PTI, the national news agency, reported that "panic gripped Kolkata following the death of some birds in the city," but gave no details.
"The situation is very, very serious in 102 villages in three districts of Birbhum, Murshidabad and South Dinajpur," West Bengal animal resources development minister Anisur Rahaman said.
"Villagers are resisting culling operations. Chickens are on sale despite a ban and reports of poultry deaths from new places keep coming," he added.