Goa, Dec. 10 -- The National Investigation Agency (NIA) has arrested another doctor in connection with the deadly Delhi blast that claimed over a dozen lives last month. Dr Bilal Naseer Malla, a resident of Baramulla district in Jammu and Kashmir, was taken into custody in Delhi for allegedly harbouring the suicide bomber and destroying key evidence linked to the attack.Dr Malla has been identified as the eighth accused arrested in the ongoing probe into the November 10 blast near the Red Fort, where suicide bomber Dr Umar blew himself up, killing 15 people and injuring several others. According to the NIA, the arrested doctor played a crucial role in the conspiracy and was part of a wider "white-collar terror module" under investigation....