Bihar Director General of Police Abhyanand said Barachatti has been detained on the basis of a voter I card in his name which was found during search inside the temple after the explosions.
He told newsmen that lab tests have so far confirmed the presence of ammonium nitre in the crude low intensity bomb used in the blasts but there were no trace of TNT or other explosive material.
Papers containing the name of the location where it had to be planted was found pasted on each bomb. "The name of the location is written in English and some words in Urdu," he added.
Kumar said the temple would be reopened for the people after the completion of search operations by NIA.
"The temple has been closed to help the NIA thoroughly search for evidences," he said.
Kumar said Sri Lankan President Mahendra Rajapakshe and several other personalities from world over had talked to him about the incident.