Can we draw the following hypothesis from the context? 

Context:

The call was made to “Proto Thema” in the morning hours of Wednesday A phone call warning of multiple bombs that will explode at 10:30′ at the at the Court of Appeals and the Courthouse at Evelpidon, Athens was made just before the 8:00′ in the morning to “Proto Thema”. “Proto Thema” immediately informed the police. The person did not give any more details and said a manifesto for the Prespa Agreement will be sent within the next few days.

Hypothesis: The caller was the bomb maker.
It's impossible to say