A man was arrested from Nalhati in Birbhum district for being allegedly involved in a post-civic poll clash that left a police sub-inspector injured in the city on April 18.
"Chatu Das (33) alias Sameer Das, an associate of Gopal Tewari, was arrested from Nalhati of Birbhum district this morning," Joint Commissioner of Police (Crime) Pallab Kanti Ghosh told PTI.
Police are also looking for Tewari, an alleged Trinamool Congress activist currently absconding, and recovered arms and ammunition from his residence.
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Das was remanded in police custody till May 11 by the city civil court where he was produced during the day.
Earlier, six persons were arrested in connection with the incident.
Sub-Inspector of Girish Park Police Station Jagannath Mondal was injured after being hit by a bullet during a clash between two parties at Singhi Bagan soon after the April 18 voting for the Kolkata Municipal Corporation.