Two of those killed were beaten to death while guarding polling stations in northern districts which bore the brunt of the violence.
"We've seen thousands of protestors attack polling booths and our personnel at a number of locations with Molotov cocktails and petrol bombs," Syed Abu Sayem, police chief of the northern Bogra district, told AFP.
Already a subscriber? Log in.
Win a prize this Mother's Day by subscribing to our annual plan now! T&C applies.
Cancel anytime. No ads. Auto-renewal. Unlimited access to the web and app. Personalised features. Members rewards.
Follow us on our official WhatsApp channel for breaking news alerts and key updates!