"bengal"

In Kolkata, CPI(M) activists along with SFI and DYFI members blocked roads in Lake Town, College Street, Jadavpur and Shyambazar Five-Point Crossing.

Bandh enforcers also blocked roads in Coochbehar and Jhargram districts, burning tyres and breaking the windscreen of buses.

Preliminary investigation has found that a technical fault in a heavy machine inside the factory caused the high- intensity blast.