Official sources said the investigators were scanning the footage of CCTV installed in the complex to locate those who were carrying the bombs -- possibly in bags or cartons -- but the quality of pictures were not so much of helpful to identify the persons.
"At least three to four people must have carried the bombs. But so far, their pictures are not visible in the CCTV footage. The task of scanning the footage is continuing," a source said.
Since Bodhgaya is frequented by around 3,000 foreign visitors and a few hundred Indians every day, it was extremely difficult for the security agencies to monitor movement of outsiders in the town.
The security plan being drawn out by the authorities after the July 2 meeting with monastery is yet to be fully implemented and private security personnel continue to guard the historic site.
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They said the National Investigation Agency has not yet taken over the case but helping Bihar Police in its probe.
The Home Ministry has not received any formal request from the Bihar government on CISF personnel providing security.
"When we receive the request, the Home Ministry will certainly consider it," the source said, adding no religious place is so far guarded by CISF but CRPF mans few religious sites.