The accused, Babu Gudgiram Kale, was apprehended on Sunday near Mulund suburb in neighbouring Mumbai, where he had been working as a labourer and selling flowers for livelihood, he said.
The gang planned to use sophisticated weapons, including AK-47, from Pakistan for the attack, the official said.
Ali, who was believed to be in a relationship with Khan back in the 1990s, sent a "direct message" to Bishnoi on Wednesday through an Instagram post.
The Navi Mumbai police have apprehended an accused wanted in connection with an alleged plot to kill Bollywood actor Salman Khan, an official said.
The Navi Mumbai police uncovered a plot to kill the actor during their investigation disclosing a video call conversation between Lawrence Bishnoi gang member Ajay Kashyap and another accused.
The DGP said after concealing the contraband, the accused persons had meticulously welded the door border and repainted it.
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