Gunmen on motorbikes ambush and kill Chandranath Rath, a 41-year-old political aide linked to the Bharatiya Janata Party (BJP), in India’s West Bengal, police said. Rath is shot dead late Wednesday near his home in Kolkata, according to reports. West Bengal police chief Siddh Nath Gupta says the attackers block Rath’s vehicle, open fire in a burst of around a dozen shots, and then flee. Gupta adds that two motorbikes used in the attack are seized; he says the bikes have fake registration numbers and investigators are searching for the assailants.

Rath is described as a close aide of BJP West Bengal chief Suvendu Adhikari, who is tipped to become state chief minister after the BJP’s election victory. The BJP wins West Bengal’s assembly election on Monday, securing 207 of 294 seats, its first-ever state win there. The killing is reported to raise the total number of people killed since results were announced to at least five.

Both the BJP and the All India Trinamool Congress (TMC), the party led by outgoing chief minister Mamata Banerjee, trade accusations over political violence. TMC rejects any role, while the BJP says it expects Adhikari to be sworn in as chief minister on Saturday.