West Midnapore (West Bengal): Hours before polling started in West Bengal''s Paschim Medinipur, a Trinamool Congress worker was allegedly stabbed to death by unidentified miscreants on Thursday, police said. A total of eight people have been arrested in connection with the incident, Police added. The deceased's brother Samiran Dolui demanded a Central Bureau of Investigation (CBI) inquiry in the case. The incident has triggered tension in the area. Voting for the second phase of the West Bengal assembly elections began at 7 am on Thursday. Voting in a total of 30 Assembly constituencies from the districts of South 24 Parganas, Bankura, Paschim Medinipur, and Purba Medinipur is taking place in the second phase of the eight-phased assembly elections in West Bengal.