In Bihar, elaborate security arrangements have been made for the sixth and last phase of Assembly elections. 26 constituencies spread over five districts of Gaya, Aurangabad, Rohtas, Kaimur and Buxar will go to polls tomorrow in this phase. AIR correspondent reports that out of 26 Assembly segments, 18 are Naxal affected.AIR Patna correspondent reports that the last phase of elections is likely to witness keen contest between ruling NDA and opposition parties.