The inspector and 20-year-old Sumit were killed when a mob attacked policemen after cattle carcasses were found in the fields on December 3.
Army soldier Jeetu Fauji is a named accused in Singh's murder, he said at a briefing when asked about his alleged involvement in the case as reported in a section of media.
The SIT team will investigate into the actual role of Fauji in the case, he said.
Army sources in Delhi said the police have contacted the Northern Command and were being given fullest cooperation.
Bhagat said the five people, who were arrested, were identified as Chandra, Rohit, Sonu, Nitin and Jitendra. He said their names were not mentioned in the FIR lodged in connection with the inspector's murder.
He said a confidential report of an inquiry conducted by ADG Intelligence S B Shirodkar has been handed over to senior officials.
To a question on the inquiry by the SIT, he said it could take some time as they have to go into details of every aspect of the case.
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)