http://news.bbc.co.uk/2/hi/south_asia/4158478.stm
A policeman with one of the explosives
The bombs were crude, homemade devices
More than 50 people have been injured in a series of simultaneous bomb blasts across Bangladesh.
Police say about 100 explosions took place in some 50 cities and towns across the country including the capital Dhaka and Chittagong.
They are said to have taken place in front of government buildings, markets, press clubs and court premises.
An outlawed Islamic group, Jamatul Mujahideen Bangladesh, says it carried out the attacks.
Reports say many of the injured have been admitted to local hospitals, although most of the injuries are not life-threatening.
The blasts caused panic across many cities leading to massive traffic jams. Reports say parents rushed to bring their children home from school.
"It's an organised attack," Home Minister Lutfozzaman Babor said, but added he was not sure who was behind the bombings.
The Associated Press reports that seven people have been arrested in connection with the blasts.
Police say most of the bombs were small, homemade devices - wrapped in tape or paper.
Unexplained
Leaflets from the Jamatul Mujahideen Bangladesh have appeared at the site of some of the blasts.
"It is time to implement Islamic law in Bangladesh" and "Bush and Blair be warned and get out of Muslim countries", the leaflets say.
"Bush and Blair be warned and get out of Muslim countries."
—Leaflet at blast site
Early this year the Bangladesh government banned Jamatul Mujahideen and another group, Jagrata Muslim Janata Bangladesh
Bangladeshi security officials search a taxi following the blasts
Security has been stepped up across the country
They were accused of being behind a series of bomb blasts, including those at two local aid agencies - Grameen and Brac.
The BBC's Roland Buerk in Dhaka said the banning was a major change in policy as the government had long insisted there was no threat from Islamic militancy.
Police and security forces were quickly deployed on Wednesday and were seen checking vehicles at Dhaka's main intersections.
Several unexplained bombs have exploded across Bangladesh in recent years.
On Saturday, one person was killed and 50 others injured after several bombs were thrown at a Muslim shrine in eastern Bangladesh.
In May last year, the British High Commissioner in Bangladesh was hurt in a grenade explosion at a Muslim shrine in the north-eastern town of Sylhet.
Three people were killed and more than 50 wounded in that attack.