The National Investigation Agency (NIA) yesterday evening detained a person named Nur Alam from Islampur of North Dinajpur district of West Bengal in connection with the recent Delhi blast near Lal Qila. Nur Alam is reported to be a resident of North Dinajpur district, and he is a student of Al Falah University of Faridabad. According to the police, he came to a village to attend a marriage ceremony.