Conversation so far:
What did Sanjay Dutt do in 2007?
Sanjay Dutt was sentenced to six years' rigorous imprisonment under Arms act for illegal possession of weapons.
What weapons was Sanjay Dutt in possession of when he was sentenced to six years' rigorous imprisonment?
Sanjay Dutt was arrested for illegal possession of arms and ammunition like 9mm pistol and an AK-56 assault rifle, which were used in 1993 Bombay Terror Attacks.

Question: Where did he serve his prison sentence?
Self-contained rewrite: Where did Sanjay Dutt serve his prison sentence for illegal possession of weapons?