The robbery plan was executed by Ram Prasad Bismil, Ashfaqulla
Khan, Rajendra Lahiri, Chandrashekhar Azad, Sachindra Bakshi,
Keshab Chakravarthy, Manmathnath Gupta, Murari Sharma (fake name of
Murari Lal Gupta), Mukundi Lal (Mukundi Lal Gupta) and Banwari
Lal.
Hence Bhagat Singh did not know about the robbery.