Personnel of the Rapid Response Team of the Animal Resources Department have fanned out across eight gram panchayat areas of West Tripura district where culling will begin tomorrow in the wake of a fresh bird-flu attack, the second time in a month, in the State. An estimated 60,000 birds would be culled in the eight gram panchayat areas, which fall within the five-km radius of Mohanpur village samples from where had tested positive on April 21, Dr Ajoy Saha, in-charge of State laboratory of ARD, told PTI today.