At least two people have been killed and several others injured following a series of bomb explosions at court buildings in Bangladesh, police say.
A suspect is arrested in Chittagong
Bombs went off in quick succession in the port of Chittagong and the eastern towns of Chandpur and Lakshmipur.
Police say they have arrested six suspects in connection with the latest bomb attacks.
More than 400 home-made bombs exploded across the country in August, killing two people and injuring more than 100.
On Sunday the leader of a banned Islamic group was arrested for suspected involvement in the August blasts.
Police had been looking for Mufti Abdul Hannan, leader of Harkat-ul-Jihad-al-Islami, since 2003 when he was sentenced in absentia to life in jail for attempting to kill then Prime Minister Sheikh Hasina.
Police said Monday's blasts took place within the space of 30 minutes around midday.
A 60-year-old man was killed and five others injured in the courtroom blast at Chandpur, about 65km (40 miles) from the capital, Dhaka.
Police say two suspects were arrested in Chandpur and three others in Chittagong.
Chandpur district police chief, Harunur Rashid, told the BBC that leaflets calling for the introduction of Islamic rule had been found on the suspects, who had confessed to being members of the banned Islamic group, Jamaatul Mujahideen.
One person was killed and five others were injured in two bomb blasts at a court building in the town of Lakshmipur.
Local police say judge Abu Sufian was the target of the bomb, which was thrown at him inside a legal book. The bomb exploded on the table in front of the judge. He escaped unhurt.
In Chittagong, Bangladesh's second city, two people received minor injuries after two explosions at court premises.
Bangladeshi Home Minister Lutfozzaman Babor said police were investigating the blasts.
Wave of arrests
No group said it carried out the August bombings, but the government blamed another banned Islamic group, Jamaatul Mujahideen, for the attacks.
The BBC's Waliur Rahman in Dhaka says more than 300 people have been arrested since then. Police said some confessed to being members of the group and carrying out the attacks.
But senior leaders of the group have still not been arrested.
The group has called for the imposition of Islamic law in Muslim-majority Bangladesh.
The Jamaatul Mujahideen and another group called Jagrata Muslim Janata Bangladesh were banned in February this year after the government linked them to a string of bomb blasts.