The National Security Council’s Counter-Terrorism Bureau issued a general advisory Thursday calling on all Israelis traveling abroad to increase alertness, citing a “concrete, high risk” of terrorist attacks.

While the warning was aimed at all Israelis traveling overseas, the bureau mentioned in particular businessmen and former public officials as possible targets.

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Citing solid intelligence, the bureau explained that “threats continue to exist against Israelis abroad, particularly business people and former officials of the security apparatus who are at a high risk for kidnapping or murder.”

Israeli travelers are asked to keep on high alert, to turn down unplanned business offers and to avoid secluded areas.

The bureau believes Israelis may be the targets of revenge operations planned by terrorists.

Hizbullah is still seeking vengeance against Israel for the alleged assassination of arch-terrorist Imad Mugniyeh in 2008, it said. Teheran has also blamed Israel for the alleged assassination of a local nuclear scientist.