Incidents of violence were reported from Murshidabad and North 24 Paraganas districts, and rural Howrah, police said.
Angry protestors torched around 15 buses, both public and private, and blocked traffic on the arterial Kona Expressway in Howrah that connects both NH6 (Mumbai Road) and NH2 (Delhi Road) to Kolkata, the police said.
Traffic movement along the expressway came to a standstill, they said.
The National Highway 34, one of the main roads that connect the north and south Bengal, was blocked in Murshidabad. Buses were also set on fire there, the police said.
Several other roads in the district were also blocked, they said.
In Howarh district’s Domjur area, the National Highway 6 was blocked as protesters set tyres ablaze and ransacked several vehicles, the police said.