It said the letter written by Vanzara "confirms in the most direct way what was known to most citizens - that the killings were executed with the full knowledge and direction of those leading the Gujarat Government".
It said the letter proved that "encounter killings (were) an intrinsic policy of the Gujarat government against terrorism.
"Modi's numerous statements at the time justifying the killings fit in perfectly with Vanzara's defence."
It added: "This episode once again highlights the utter contempt that the BJP and its leadership, including Modi, have for the constitution of India and the law of the land."
