The video, captured by a CCTV camera inside the high-security jail, showed the attackers descending from the first floor by clinging to bed sheets using them as a rope and then barging into Tajpuriya's cell on the ground floor to attack him.
Salman and his father Salim Khan had received a death threat on June 5, days after Punjabi singer Sidhu Moose Wala was shot dead in Punjab's Mansa district on May 29.
The NIA had registered three cases last year following information suggesting that terrorist outfits and their sympathisers abroad were operating as members of organised criminal gangs active in the northern states of India for targeted killings and violent criminal acts.
Six persons were travelling to Punjab from Hemkund Sahib Yatra in a vehicle which was intercepted by Uttarakhand STF and local police following a tip-off.
Those covered under the raids also included gangsters involved in the murder of Punjabi singer Sidhu Moosewala.
A few days ago, the Crime Branch had taken jailed gangster Tillu Tajpuriya -- one of the prime conspirators -- in its custody to grill him about Gogi's killing.
The Delhi police special cell has arrested three persons, including two shooters, in connection with the killing of popular Punjabi singer Sidhu Moosewala, officials said on Monday.
Bishna Ram gang member, Ashok Bishnoi, who was wanted in the Bhanwari Devi murder case, surrendered before police in Jaloda village of the district on Tuesday.
Intensifying efforts to trace the body of missing nurse Bhanwari Devi, the Central Bureau of Investigation has zeroed in on places in Jaloda village where she could have been buried and are scouting the area using sophisticated devices.
Age at one level is over-rated, feels Harbhajan Singh, the veteran of 103 Tests and 236 ODIs.