Security was tight across the capital, Dhaka, with extra police and paramilitary guards patrolling the streets yesterday.
The violence comes at a time of deep tension in Bangladesh, a nation struggling to overcome extreme poverty, rancorous politics and a string of horrific accidents linked to the garment industry.
The election, expected in January, has become a flashpoint in the decades-old rivalry between Hasina and Bangladesh Nationalist Party chairwoman Khaleda Zia, leader of the opposition.
The opposition says Hasina’s government is not capable of holding a credible election and wants a neutral caretaker administration from outside the political parties to oversee the vote.
Hasina has agreed to form a caretaker government, but one including members of both the ruling and opposition parties.