Immediately, police teams were sent to various places, including Singh's residence from where two pistols and an AK rifle were seized. "Two wanted militants and our officer. and a third person were arrested in the operation", Kashmir police chief Vijay Kumar told reporters.
As per the Jammu and Kashmir Police, the 1990-batch sub-inspector was also removed from the elite Special Operation Group once over frequent complaints of extortion and corruption against him.
"The police officer (Singh) has worked on several anti-militancy operations".
India quickly blamed Pakistan-based militant groups for the attack, prompting a months-long military stand-off between the two hostile neighbours.
Addressing a press conference on Sunday, inspector general of police for J&K Vijay Kumar was quoted by PTI as saying that although Singh "has worked on several anti-militancy operations but the circumstances under which he was arrested yesterday when he was driving the vehicle with militants towards Jammu is a heinous crime". However, Guru's claim was never taken seriously, and Singh was let off without any proper investigation. Guru was later convicted for his part in the attack and hanged.
SIT officials, sources said, were poring over the files of the Parliament attack, which was believed to have been masterminded by a non-local Lashkar-e-Taiba (LeT) "commander", Gazi Baba, who was able to set up links with local people in Kashmir and lived in the congested and secured locality of Qamarwari for many years.
But back then, both the state police and the intelligence agencies had dismissed those allegations as a figment of imagination of a terrorist's mind. The militants were identified as top Hizbul Mujahideen commander Naveed Babu, and his accomplices Irfan and Rafi.
In a separate incident, three members of the Hizbul Mujahideen group, including their top commander, Hamad Khan, were killed in a gun battle in Kashmir on Sunday, Kumar said.
"We have done it in the past in many cases and now in this particular case where it has caught its own officer on its own input and action and would continue to abide by our code of conduct and the Law of the Land which is same for everyone".
The IGP denied allegations about police's involvement with militants, saying "it can not be generalised".
He refused to divulge details of the ongoing investigation in the case but said the case would be probed from all angles.
It was not immediately clear how or why Singh came to be travelling with the suspected rebels.
Last week, he was among the officers who received New Delhi-based foreign envoys of 15 countries who came to visit the region now under a communications and security lockdown. "Dysp Davinder Singh is not awarded any Gallantry or Meritorious Medal by MHA as has been reported by some media outlets/persons Only gallantry medal awarded to him during his service is by the erstwhile J&K State on Independence Day 2018.for his Participation in countering a Fidayeen Attack by Terrorists at District Police Lines Pulwahma on 25/26 Aug 2017 when he was posted there as DySP District Police Lines Pulwama", the official handle of the Jammu and Kashmir police tweeted.
"We will ask him about the attack in the interrogation", the police chief said.