After calling the vandalism at the Presidency University "trivial", the Trinamool Congress on Saturday claimed the whole incident was "staged".
"The vandalism at Presidency University was entirely staged," Trinamool secretary general Partha Chatterjee said here.
However, Chatterjee later retracted his statement saying that he wanted investigators to find out if the opposition CPI-M was behind the attack.
"I never said it was staged. I just said that there was a need to investigate if the incident was staged by the CPI-M workers who have a history of indulging in such activities," Chatterjee said.
Armed with sticks and rods, Trinamool Congress Chhatra Parishad members stormed the Presidency University campus Wednesday. They assaulted students, including women, and vandalised the famous physics department at the varsity.
They ransacked the century-old Baker Building that houses the physics laboratory where eminent scientists like Jagadish Chandra Bose, Satyendra Nath Bose and Meghnad Saha conducted researches.
The vandalism was a part of a series of statewide retaliatory attacks in the wake of the heckling of Trinamool supremo and West Bengal Chief Minister Mamata Banerjee and one of her ministers in New Delhi, allegedly by SFI students earlier Tuesday.
Chatterjee Thursday had described the vandalism as "trivial" and castigated the media for giving it more attention than the heckling of Banerjee.