To ensure secure assembly elections in Chhattisgarh's Maoist-affected Bastar region after the poll boycott call by Maoists, the home ministry has increased the number of unarmed aerial vehicles (UAVs) for round-the-clock surveillance. About half a dozen indigenous UAV Netra, owned by the CRPF, have been deployed and over 50,000 security forces have been inducted in the region.