BJP supporters held angry protests outside the party's election office in Kolkata all day today, even heckling senior leaders Mukul Roy, Arjun Singh and Shiv Prakash, to protest against the fielding of a large number of former Trinamool leaders as BJP candidates. This on a day when Amit Shah landed in Kolkata unexpectedly to stay the night on his way from Guwahati to Delhi and the BJP party chief, JP Nadda, landed for a day-long campaign tomorrow.