The Embassy was closely pursuing the Afghan police's investigation into the murder. Afghan police arrested six persons, Khurshid said in a letter to Trinamool Congress MP Kunal Ghosh.
Banerjee, who was married to an Afghan national, was murdered on September five in that country. She was known for her fight on issues of women's emancipation and gender justice in Afghanistan.
"The Embassy of India in Kabul was not aware of her return to Afghanistan as she had not registered with them as Indian nationals are normally expected to do," the Minister said in the letter to Ghosh who had raised the issue in Rajya Sabha in the last session.
Khurshid said that soon after the incident, the Embassy had established contact with the local Afghan authorities and ascertained the details.
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"Ambassador Amar Sinha spoke on telephone to the husband of Sushmita. The Embassy was in touch with her brother in West Bengal," he said.
Banerjee's book "Kabuliwalar Bangali Bou" (A Kabuliwala's Bengali Wife), about her escape from the Taliban in 1995, became a bestseller in India and was made into the Bollywood film "Escape From Taliban" in 2003.
A renegade Taliban militia, the suicide group of the Islamic Movement of Afghanistan, had taken responsibility for killing Banerjee, claiming she was an "Indian spy".