Article published on the 2008-06-07 Latest update 2008-06-07 13:36 TU
Most of the detainees were picked up in Moratuwa, where 21 civilians were killed on Friday. The Kandy blast killed two passengers.
Correspondent Minelle Fernandez reports that only one suspect has been kept for further questioning, after the majority appeared in magistrates' courts on Saturday afternoon.
Sri Lankan newspapers report that many of those detained in house-to-house searches were university students belonging to the island's Tamil miniority.
Police have blamed bombings on the Liberation Tigers of Tamil Eelam (LTTE) who are fighting for a Tamil homeland in the north and east. The guerrilla group has not commented on the bus bombs and has previously denied attacking civilians.