Israel fears reprisal after Hezbollah chief killed

By Dan Williams

JERUSALEM (Reuters) - Israel put its embassies and other interests abroad on high alert and reinforced troops on the Lebanese border on Thursday after the assassination of Hezbollah's top guerrilla commander.

Hezbollah's chief Sayyed Hassan Nasrallah threatened Israel with "open war" after the Shi'ite Muslim group and its main backer Iran accused the Jewish state of killing Imad Moughniyeh with a car bomb in Damascus on Tuesday.

The Israeli government rejected the charge, although its Mossad spy service had long regarded Moughniyah as a "terrorist mastermind".

Prime Minister Ehud Olmert's office advised Israelis that the Counter-Terrorism Authority, which issues travel warnings, recommended Israelis overseas avoid congregating in large groups and cautioned they could be targets of kidnapping attempts.

"Hezbollah has yet again accused Israel of killing Imad Moughniyah, which points to an increased threat of terror attacks by Hezbollah against Israeli targets abroad," Olmert's office said in a statement.

With supporters of the Shi'ite Lebanese militia urging revenge, Israel stepped up already stringent security measures.

"Our diplomatic missions are on high alert, and this could be the case for weeks or even months -- it depends on our risk assessments," a security source said. "There have also been precautions taken in terms of our (Lebanese) border garrison."

Moughniyah, who had also topped U.S. wanted lists, was the most senior member of Hezbollah to be killed since its previous secretary-general, Abbas Mussawi, was killed in a 1992 Israeli helicopter ambush in southern Lebanon.