Additional Director General (Law and Order) Daljeet Chowdhary told the media that the slain officer had some personal as well as professional matters, adding separate teams of ATS, STF and U.P Police have been constituted to inquire into the same.
"We are gradually zeroing-in on some personal matters. Analysis of evidences collected by the forensic science and questioning of people are leading us to a personal matter of the slain officer that can be a reason behind his murder. We hope soon we will work out the case and arrest the accused," he added.
When asked about the two people earlier traced by the police in connection with this case, Chowdhary said the investigation found them not to be involved in the NIA officer's murder case in any way.
Responding to a poser if the investigators had dropped the terrorism angle in the murder, Chowdhary said, "We are looking into terrorism issue as well. An ATS team is working on it with the help of other agencies, but as of now the probe point at some personal matter and we will soon unveil it."
Talking about the killers, he said there were two motorcycle-borne masked assailants - one was riding the motorcycle while another fired the shots.
The DG (Law and Oder), however, refused to answer whether the police had identified the assailants or their gang.
Speaking about the health of the slain officer's wife, he said she is still critical.
Tanzil was on his way back from the marriage ceremony of his niece, along with his wife and two children, when two armed bike-borne assailants shot at him and his wife in a village under Syohra Police Station area late in the night of April 2. The NIA officer died on the spot, while his wife was rushed to Fortis Hospital in Noida.
The police are trying to identify the assailants against whom a case has been registered at the Syohra Police Station and find out the motive behind the killing.