A new picture of Amritpal Singh with his key aide Papalpreet Singh surfaced Monday on social media as another close associate of the radical preacher was detained under the stringent National Security Act.

Amritpal Singh has remained untraceable since a police crackdown against him and members of his ‘Waris Punjab De’ began in Punjab on March 18.

Officials said the picture was taken a day after the police operation against the Khalistan sympathiser began. Both men looked relaxed; Amritpal Singh is seen holding a beverage can.

In another development, Amritpal Singh's close associate Varinder Singh alias Fauji was nabbed by the Amritsar Rural police.

He was part of the private security set for the preacher, police said.

A senior police official said the National Security Act has been invoked against Varinder Singh and he was being sent to the Dibrugarh Jail in Assam, where some alleged Amritpal Singh associates are already being held under the NSA.

Papalpreet Singh, who appears in the picture, is said to be Amritpal Singh’s mentor. He was allegedly in contact with Pakistan’s spy agency ISI.

In the photo, Amritpal Singh is seen wearing a jacket, a maroon turban and sunglasses. His companion, sitting beside him, is in a sweatshirt.

The police operation began about three weeks after Amritpal Singh and his supporters stormed into the Ajnala police station near Amritsar to secure the release of an arrested man. Six police personnel were injured.

Amritpal Singh and Papalpreet Singh were allegedly harboured by a woman at her home in Shahabad in Haryana's Kurukshetra district on March 19, police had earlier said.

On March 25, CCTV footage emerged purportedly showing Amritpal Singh talking on a mobile phone.

The preacher escaped the police dragnet in Jalandhar district on March 18, switching vehicles and changing appearances.

He and his associates have been booked under several criminal cases related to spreading disharmony among classes, attempt to murder, attack on police personnel and creating obstructions in the lawful discharge of duty by public servants.

The Punjab Police on Sunday said it has released 197 people out of 353 till then taken into preventive custody on apprehension of breach of peace and disturbance of law and order.

Except for the headline, this story has not been edited by The Telegraph Online staff and has been published from a syndicated feed.