The opposition says the trials are politically motivated.
The latest general strike — a common political tactic in Bangladesh — saw schools and most businesses in Dhaka closed. Security was tight with thousands of officers deployed across the capital and traffic was thin on the streets.
Police detained eight Jamaat-e-Islami activists Monday after bombs exploded in at least four neighborhoods in the capital, said police official Anwar Hossain.
Fire official Brojen Sarker said nearly two dozen vehicles had been torched in Dhaka on Sunday.
Setting fire to cars and setting off small bombs before or during a strike is a common tactic aimed at scaring people into staying off the streets.
The strike was to continue Tuesday.