West Bengal, Apr 25 (ANI): The fourth phase of the West Bengal Assembly elections began on Monday with beefed up security, including adequate deployment of Central paramilitary forces. 49 constituencies spread over North 24 Parganas and Howrah districts are going to polls in this phase. 345 candidates, including 40 women, are in the fray for this phase. Across 49 seats in North 24 Parganas, Bidhannagar and Howrah district, a total of 1.08 crore voters will exercise their franchise in about 12,500 polling stations from 7 a.m. to 6 p.m.