After completion of the formalities, home secretary R K Singh wrote to foreign secretary Rajan Mathai to inform Kasab's mother and other family members who are in Pakistan.
Accordingly, the authorities, through the Indian High Commission in Islamabad, had sent a letter to his mother through courier yesterday, fulfilling his last desire, the sources said.
The 25-year-old LeT terrorist was hanged at 7:30 am this morning in Yerwada jail in Pune. He was informed on November 12 about his hanging, the sources said.
The Indian High Commission in Islamabad informed the Pakistan government about Kasab's hanging through letter. When Pakistan refused to take the letter, it was sent through fax.