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New Delhi, Mar 30 (ANI): External Affairs Minister Sushma Swaraj on Thursday promised not only impartial probe into the Nigerian students attack case but also assures stringent action against the perpetrators. Swaraj told parliament she was in touch with the chief minister of northern state of Uttar Pradesh, Yogi Adityanath, to expedite the investigation. Five Nigerian students were attacked by crowds and one was beaten by a mob inside a shopping mall in Greater Noida, on the outskirts of New Delhi.