New Delhi: The National Investigation Agency (NIA) has released four individuals, three doctors and a fertiliser dealer, who were detained in connection with the November 10 Red Fort blast, after investigators found no concrete evidence linking them to the main accused, Dr Umar Un Nabi. The development was first reported by India Today.

Dr Rehan, Dr Mohammad, Dr Mustaqeem and fertiliser trader Dinesh Singla were arrested from Haryana’s Nuh district. All four had past links with Umar and were associated with Al-Falah University, which has come under the radar over suspected terror-related activities. Investigators also examined whether explosive materials were procured from any fertiliser dealer, but no such link could be established.

After three days of intensive questioning, officials f

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