Conversation so far:
What did Dutt do in 2007?
On 31 July 2007, the TADA court sentenced Dutt to six years' rigorous imprisonment for illegal possession of weapons and cleared him of charges relating to the Mumbai blasts.
What weapons was he in possession of?
he had bought a pistol from Qayuum in Dubai.

Question: Where did he serve his prison sentence?
Self-contained rewrite: Where did Sanjay Dutt serve his prison sentence?