Sources said security personnel were put on a high alert in areas of Modhwapur, Khutauni, Fulparas and Laukaha so that the elections are free, fair and peaceful.
Similarly, a special watch is being kept in Supaul, Purnia, Kishanganj and Araria districts since this morning with specially-trained dogs mobilised for the purpose.
"Over 45,000 personnel of the Central paramilitary forces have been made available by the Centre for free, fair and peaceful polls," a senior official in the home department said.
Here is a file of the first phase:
Number of assembly constituencies - 47
Total number of candidates - 631
Total number of woman candidates - 52
Party-wise list of candidates - Bahujan Samaj Party (45), Bharatiya Janata Party (21), Communist Party India (11), Communist Party of India-Marxist (7), Congress (47), Nationalist Congress Party (33), Janata Dal-United (26), Rashtriya Janata Dal (31) and other parties 156.