The attack took place when Bhattacharya and Roy were not present at the spot.
All six phases of ongoing Polls in West Bengal were marred with violence. Last week, a convoy of West Bengal BJP chief Dilip Ghosh and Assam Minister Hemanta Biswa Sarma was allegedly attacked by Trinamool Congress (TMC) supporters in Khejuri area of Purba Medinipur district.
In an unprecedented action, the EC on Wednesday cut short the campaigning period in West Bengal by a day for the final phase of the Lok Sabha elections in view of the violence during Shah's roadshow on Tuesday.
Campaigning was originally scheduled to end at 5 pm on Friday for the nine constituencies that will go to polls on May 19.