The word "apparently" indicates that there is doubt or uncertainty about something. The bomb went off in front of the BJP office, but that office might have been an unlikely target for a bombing, and so this makes one wonder if that office was the actual target of the bombing. Investigators try to reconstruct the bomb from its fragments, and initial indications are that the bomb was strapped to a motorbike, as described in sentence 2, but this is early in the investigation and many things are still not completely certain.
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