By Waliur Rahman
BBC News, Dhaka
Police in Bangladesh have arrested a prominent Islamic leader in connection with last week's wave of bombings.
Police have conducted several raids in the wake of the bombings
Moulana Fariduddin Masud, a senior member of the Jamaate Ulamaye Islam group, was detained at the main airport in the capital, Dhaka.
He was taken off a flight that was bound for Dubai.
Two people were killed and more than 100 wounded when around 400 bombs went off nearly simultaneously throughout the country last Wednesday.
Moulana Masud was later taken into the custody of the elite anti-crime force, the Rapid Action Battalion (RAB), for interrogation.
Little is known about him but police said he was among 20 people wanted in connection with the attacks.
Police also named Abdur Rahman as one of the main suspects for the bombings and said raids were being conducted to arrest him.
Bangladesh's police chief, Abdul Qaiyum, said Mr Rahman was the leader of the banned Islamic group, Jamatul Mujahideen.
Mr Qaiyum said police were focusing their inquiries on this group because leaflets bearing its name and calling for the introduction of Islamic rule in Bangladesh were found at blast sites.
Home ministry officials told the BBC they were convinced Mr Rahman had already left the country.
They said Mr Rahman was on a list of 17 people distributed to the international police organisation, Interpol.
His group was banned in February after the government blamed it for earlier bombings in the country's northern region.
The man believed to be the group's spiritual leader, Asadullah al-Ghalib, was arrested following the ban.