The group were handed jail terms ranging from three to eight years at a court in the southern state of Kerala after being convicted last week on charges including attempted murder and conspiracy.
T J Joseph, a lecturer at Kerala's Newman College, was attacked in June 2010 following an allegation that a Malayalam language question paper he had set for his students included derogatory remarks about Prophet Mohammad (pbuh).
Joseph has denied the allegation of blasphemy, saying he lifted the question from a book approved by Newman College which mainly caters for post-graduate students.
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The attackers, followers of a radical extremist group known as the Popular Front of India, dragged Joseph out of his car on his way home from Catholic mass before severing his wrist with a sword.
The attack caused widespread outrage in Kerala, a southern state with a large Catholic population. Prosecutors produced more than 300 witnesses before the court to establish their guilt.
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