One person was killed and five wounded in a blast at a Trinamool Congress office in West Midnapore district of West Bengal on Thursday, ANI reported. The explosion took place at Makrampur village in Narayangarh.

A police team rushed to the spot to investigate the incident, which took place around 10 am minutes before a meeting was supposed to start, PTI reported. The wounded were admitted to the Midnapore Medical College Hospital, with two of them criticially injured, reported the Hindustan Times.

Trinamool Congress MLA from Narayangarh, Pradyut Ghosh, said that the cause of the blast could not be ascertained till noon.

But Opposition party leaders claimed that crude bombs stocked inside the building caused the explosion, according to the Hindustan Times. BJP district president in West Midnapore, Samit Dash, claimed that the bombs had been stocked by Trinamool workers to create an atmosphere of fear.

“Since the process of forming the panchayats started this week, the ruling party supporters needed the bombs to strike fear in the villages,” he said. Anil Sikaria, a district Congress leader, also claimed that Trinamool workers had stored bombs in the office.

However, Trinamool’s West Midnapore District President Ajit Maity said that the blast was caused by a cylinder explosion, according to the Hindustan Times. “The gas cylinder kept in the party office exploded as our party men were gathering for a meeting,” he said. “The Opposition is spreading lies to malign us.”