After laying a wreath on the body of slain SP of Pakur Amarjit Balihar at the Jharkhand Armed Police premises at Doranda here, Kumar told reporters that a state-wide operation would be launched against the Maoists.
Pakur and Dumka were also yesterday officially declared as Maoist-hit taking the number of such districts to 20 of the total 24 in the state.
He said that yesterday's incident was an ambush by Maoists. Earlier, Governor Syed Ahmed and several senior government officials placed wreaths on the body as buglers sounded the last post.
The governor consoled the wife and two daughters of the police officer, an IPS officer of 2003 batch, who was a target of Maoists because of his tough stand against them since his posting at Pakur.
Chief Secretary R S Sharma, the Governor's two advisers, Madhukar Gupta and Anand Shankar were also present.
After the ceremony, the body of the police officer was taken to his home at Purulia Road here from where it would be taken to a church, before being laid to rest. Balihar was the second SP to fall victim to the ultras.
On October 4, 2000, the ultras of the erstwhile Peoples War, which merged with CPI (Maoist), had killed Lohardaga SP Ajay Kumar Singh in undivided Bihar.
Lohardaga later became part of Jharkhand. The Maoists had also killed several policemen, civilians and political leaders like CPI (ML-Liberation) MLA Mahendra Prasad Singh, JD(U) MLA Ramesh Singh Munda and JMM MP Sunil Mahato in the last 12 years.