The Bulgarian President Rosen Plevneliev was quoted by the national news agency as saying that he received no advance warning of an expected attack when he held a meeting with Israel's intelligence agency, Mossad, last month.
He said that the two countries' intelligence agencies share a good relationship and that he would have acted on any lead.
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Armed police have taken part in a dramatic training exercise aimed at recreating the chaos of a Paris-style terror attack.
After a remarkably mild November - a notable mild start to the new month.
The Facebook founder revealed the plan as he and wife Priscilla Chan announced the birth of their baby daughter, Max.