A new three-storey BJP party office here, inaugurated by its national president J.P. Nadda last month, was on Thursday stoned by party workers during an alleged clash between two factions over charges that BJP district president Sandip Nandi neglected old-timers for turncoats.

Sources said at least three BJP workers were injured and many windows panes were damaged as members of Nandi’s rival faction attacked the office — named after revolutionary Rash Behari Bose — with bricks and stones. The attack happened on a day home minister Amit Shah tweeted tributes to mark Bose’s death anniversary.

BJP sources said the clash erupted during a meeting held by district observer Sawar Dhanania at the party office, when old-timers protested against the inclusion of newcomers, mainly those from Trinamul, to the district apex committee. Heated exchanges led to scuffles. BJP old-timers allegedly hurled brickbats at the office and set on fire three mini-trucks. Police have rounded up seven BJP workers.

BJP state president Dilip Ghosh blamed Trinamul. “BJP workers simply can’t ransack their own party office. Trinamul was behind it,” he said.