The nun was attacked after the robbers ransacked the Convent of Jesus and Mary in Ranaghat and stole cash and other items.

A holy scripture was also torn and a statue of Jesus was broken.

The 71-year-old nun needed surgery after the brutal attack in 2015 which an Indian court described as shameful.

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The court in the state capital, Kolkata, found Nazrul Islam guilty of rape and attempted murder, among other offences.

“It was a shameful act,” additional judge Kumkum Singha told the packed City Sessions Court.

Singha said Islam acted alone in raping the nun, adding that five others arrested for their involvement were charged with offences unrelated to the sexual assault.

Islam will be sentenced on Wednesday.

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