Voting in the lone Lok Sabha parliamentary seat ended peacefully on Thursday, with an estimated 78 per cent voter turnout.
"Polling has been conducted in a free, fair and peaceful manner with no report of major incidents," Sinha said.
However, he said there were reports of snags in some electronic voting machines (EVMs) but these were quickly replaced.
Nagaland has 12,13,777 voters, including 596,134 women.
Chishi, the richest candidate in the fray, is backed by the opposition Naga People's Front.
"We are confident of winning the election with a comfortable margin," Rio told IANS.
Meanwhile, 83 per cent of the 12,482 voters cast their votes to elect their new member to the Nagaland assembly from Aonglenden constituency.
The NDPP fielded Sharingain Longkumer against Congress' Alem Jongshi Longkumer.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)