(Ahlul Bayt News Agency) - Scores of demonstrators and several officers were reported to have been injured during the anti-government clashes in the industrial towns of Fatullah and Kanchpur, outside the capital Dhaka.
The main opposition Bangladesh Nationalist Party (BNP) and various Islamist parties enforced a strike from Sunday morning to protest against the removal of "absolute faith and trust in Allah" as a key pillar of the constitution.
Much of Bangladesh has been shut down for four of the last eight days.
Fatullah, home to hundreds of factories making clothes for top global retailers, was hit by hours of fighting as police battled with protesters who threw bricks and blocked highways.
"The activists attacked us. They beat seven of our officers who are injured. We shot rubber bullets and tear gas to disperse the unruly crowds," Fatullah police chief Ainul Haq told.
At Kanchpur, police also used rubber bullets and tear gas to break up protests blocking a key road linking Dhaka with the port city of Chittagong, police said.
The secular government made changes last month to restore the secular character of the original national constitution of 1972. Islam however was retained as the state religion.
Across the country on Sunday shops, businesses and schools were closed. Police baton-charged protesters trying to march in central Dhaka, and at least 18 people were arrested.
Around 10,000 policemen were on patrol in the capital, police spokesman Masud Ahmed said, adding magistrates were on duty to hand out on-the-spot jail terms.
In Chittagong, 36 people were arrested in a pre-dawn swoop on the protesters, city police chief Meshbah Uddin Ahmed told.
/106