The NIA has arrested a key aide of Canada-based Khalistani terrorist Lakhbir Singh Sandhu alias Landa in a major terror network case involving the supply of deadly weapons for extortion from businessmen among others, an official statement said on Friday.

Baljeet Singh alias Rana Bhai alias Balli, hailing from Barwani district of Madhya Pradesh, was arrested on Thursday, the National Investigation Agency (NIA) said in the statement.