Dhaka police front man Masudur Rahman said police used sound grenades, water cannon, tear gas and rubber bullets to disperse at least 70,000 Islamists who were camped at a key commercial district in a push for a new blasphemy law.
"We were forced to act after they unlawfully continued their gathering at Motijheel. They attacked us with bricks, stones, rods and bamboo sticks," he told AFP, adding that the protesters had dispersed early Monday morning.
Police inspector Mozammel Haq at Dhaka Medical College Hospital told AFP 11 bodies were taken to the clinic including several who were hit by bullets and a policeman who had been hacked in the head by protesters with machetes.
Eleven other bodies were taken to three clinics including four at Al Baraka and seven at two branches of Islami Bank hospitals which are based close to the trouble spots.
Hospital officials said hundreds of people were maimed.
The violence erupted
Sunday afternoon and continued through until the early hours of Monday morning.It came after hundreds of thousands of Islamists demanding a new blasphemy law on Sunday blocked highways and fought running battles with police, leaving 10 people dead and hundreds injured in the Bangladeshi capital.
Chanting "Allahu Akbar!" ("God is greatest!") and "One point, One demand: Atheists must be hanged", activists from the hardline Hefajat-e-Islam marched along at least six highways, blocking transport between Dhaka and other cities.
Police said about 200,000 people had marched to central Dhaka, where fierce festivities erupted between thousands of rock-throwing protesters and security officials, with police beating back demonstrators with batons.