The judge of Jalpaiguri Court granted the 14 days of remand to CID officers.
The blast left six persons dead.
Three KLO persons -- two senior leaders and a courier -- were arrested from Adhikari area near Indo-Nepal border in Darjeeling district yesterday.
The three are KLO Deputy Commandant Ilyias Siddiqui alias Pradip Roy, KLO Assistant General Secretary Tarun Thapa alias Narayan Roy and Ramshankar Basak, a courier.
While the first two had plotted the bicycle blast at Bajrapara on December 26, the martyrs' day of the KLO, Basak had kept the bicycle at the spot, Shamim told a press conference this evening.