New Delhi, Sep 27 (IANS) Bollywood star Abhishek Bachchan, scheduled to visit the capital Sunday for promotionals ahead of his forthcoming Drona, decided to postpone his trip after a blast in south Delhi Saturday, publicists said.Bachchan was to visit the Radio Mirchi and address a press briefing, but the trip was cancelled, the FM radio station as well as the publicists organising the media interaction said late Saturday.