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Police said the houses were set aflame at Radhakishorepur under Khuntuni police station area following the clash on Friday.
A large number of Congress workers led by party candidate for the polls Suresh Chandra Mohapatra later gheraoed the police station alleging BJD sympathisers were behind the incident.
The incident followed the clash between rival BJD and Congress activists at Joranda village under the block on Thursday last leading to the injury of at least seven persons from the two sides.