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The accused, identified as Arif Abubakar Shaikh (59) and Shabbir Abubakar Shaikh (51), were placed under arrest on Thursday.
Dawood Ibrahim Kaskar, patronised by Pakistan's spy agency Inter-Services Intelligence (ISI), is believed to be residing in Karachi and is accused in several cases of cross border crimes including the 1993 Mumbai serial blasts.
An FIR in this connection has been registered with the Special Cell of Delhi Police, which keeps a close tab on underworld and terror activities in the national capital.