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Dalla was designated as a terrorist by India in 2023.
The Peel police have charged three people in association with the violence.
He urged the Canadian government to ensure justice and uphold the rule of law.
A spokesman for the Peel Regional Police told AFP that no arrests had been made.
Pannun, the founder of the banned group Sikhs for Justice (SFJ), holds dual citizenship in Canada and the US.
The official, identified as 39-year-old Vikas Yadav, was reportedly employed by the Cabinet Secretariat, which oversees RAW.
The arrested is Baljeet Singh alias Rana Bhai alias Balli. He is a native of Barwani district in Madhya Pradesh.
SFJ was declared a banned organisation five years ago under the Unlawful Activities (Prevention) Act.
The Federal Bureau of Prisons inmate records on Sunday showed him held at the Metropolitan Detention Centre in Brooklyn.
Judge Mark Jette spoke to the men through an interpreter as he placed them under a no-contact order.
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