Two persons were on Wednesday detained for questioning in connection with the bomb blast in Bangalore, police sources said.
The sources declined to share further details, including identity of those detained.
However, police said the investigation is in progress and the National Investigation Agency was coordinating with the state police.
The blast opposite the BJP office at Bangalore on Tuesday left 16 persons, including 11 police personnel, injured.
Police have traced the registeration number of the motorcycle which was used for the blast to Tamil Nadu.