The agency has charged six policemen with criminal conspiracy and murder, while another personnel has been charged with destruction of evidence, they said.
The findings of the agency are based on forensic opinion, field investigation, expert opinion of the Central Forensic Science Laboratory, post-mortem report, they said.
The agency also elicited opinion of doctors from AIIIMS and collected a huge volume of records during the investigation into the encounter of Zamir Khan on January 20, 2012, the officials said.
The alleged extrajudicial killing took place in the Kiyamgei Santipur area of Manipur.
"The NHRC collected reports from various authorities and examined the same. The commission did not accept police's account and held that Zamir Khan was not killed in a genuine encounter," the CBI FIR had alleged.
The CBI also filed a closure report in the case of Longjam Dhamen, who was killed by a team of CDO Imphal West in an alleged encounter on February 21, 2012.
The agency said its investigation shows that Dhamen, an alleged kidnapper, was killed in police action.
The abducted person was rescued. An investigation by the National Human Rights Commission is also underway.
Recently, the CBI had filed charge sheet in two encounter cases involving 14 police personnel.
The court had reportedly told Verma, "According to you, there are 14 murderers in these cases and they are loafing around Manipur freely?"
Asked about the SC's observation, the agency said it had informed the court that the CBI had filed two charge sheets against 14 personnel of the Manipur Police for "criminal conspiracy, murder and destruction of evidence" after thorough investigation.
"We have not made any further observations regarding the charge sheeted persons other than submitting these facts before the Supreme Court. The matter is pending trial before the learned court," CBI spokesperson Abhishek Dayal said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)