The decision was taken in view of the high number of casualties in the worst terror strike in the state since the Uri attack in 2016.
An NIA team with forensic experts is being sent to Srinagar to assist Jammu and Kashmir Police in forensic evaluation of the scene of crime, a home ministry official said.
Explosive specialists of the Black Cat commando force NSG will also join in the investigation into the attack, another official said. Explosive specialists of the Black Cat commando force NSG will also join in the investigation into the attack, another official said.
(With Agency inputs)