Israel's counter-terrorism bureau warned on Sunday of a "concrete, high-level threat" that the Lebanese Hezbollah guerrilla group planned an attack against Israelis to avenge the February 2008 assassination of Imad Mughniyah, its deputy leader.
"The Hezbollah organization is apparently prepared to carry out a serious attack (assassination, kidnapping) against an Israeli target, including abroad. This attack threatens every Israeli, especially those holding senior position," a statement from the counter-terrorism bureau said.
The statement warned Israelis travelling overseas to take precautions, and to avoid visiting countries the bureau has warned against.
Israelis abroad should be on the alert and avoid, for example, tempting offers, whether for business or pleasure, from suspicious or unfamiliar persons, and should refrain from unscheduled meetings in remote areas after dark.
Israelis staying abroad for long periods of time should also vary their routine, for example by changing hotels or switching between restaurants and other venues visited frequently.
Mughniyah, who was responsible for attacks against Israel and western targets, was killed by a car bomb in Damascus in February 2008.
Although no one claimed responsibility for his assassination, Hezbollah blamed Israel and swore it would extract revenge.