As in the first phase of polls in six seats in naxal-hit areas, two helicopters would be in service in the second phase of voting also, Sinha told reporters.
Accompanied by director general of police Abhyanand, he said 152 companies of central forces and 74 Bihar Military police would be on duty on April 17 polling.
Of the central security forces, 35 companies would be of BSF, 12 ITBP, 12 CRPF, 34 SSB (Shahastra Seema Suraksha Bal), CISF 5, RPF 15 and 20 companies of SAP (Special Auxiliary Police) of Madhya Pradesh.
To ensure peaceful polling, altogether 44,136 arrests have been made.
Patna Sahib, Patliputra, Jehanabad, Nalanda, Munger, Ara and Buxar would witness voting on April 17 in Bihar.
Actor-politician Shatrughan Sinha, Lalu Prasad's daughter Misa Bharti, her two uncles Ramkripal Yadav and Ranjan Yadav, former Home Secretary R K Singh and real estate baron Anil Sharma were trying their luck from different constituencies.
Some areas in Jehanabad, Munger, Lakhisarai and Patliputra have witnessed naxal activities in the past.