Altogether 250 crows have died in Hazaribagh district in the last 48 hours following an undiagnosed disease.

District animal husbandry officer Yamuna Prasad said the birds died at Bishnugarh and Katkumsandi blocks, and their faeces would be sent to Indian Veterinary Research Institute, Bhopal and Indian Institute of Virology, Pune for tests.

"After getting the reports we have deputed a team to create awareness among the villagers at every 5 km with necessary instructions like not to handle the dead crows without gloves and bury the birds immediately and using masks," he said.

According to Satya Prakash, the state coordinator of the Indian Bird Conservation Network, said tests on crow deaths in Jamshedpur and Bokaro have been found to be H5N-1.

"The crows died in these two blocks due to some virus which may be the same that hit the birds in Jamshedpur, Bokaro and Ranchi during the last fortnight," he said.