Israelis are watching anxiously as anti-government protests continue in Egypt - one of the country's only friends in the Arab world.
"Judgement Day" for President Hosni Mubarak was the full-page headline jumping from the Hebrew-language newspaper Yedioth Ahronoth in Israel on Tuesday.The implications of regime change in Egypt would be enormous here."We are concerned. We are watching this very anxiously," says Dan Gillerman, a former Israeli ambassador to the United Nations.
"This is a very, very tough neighbourhood," he says.
"We are already facing Hezbollah in Lebanon, Hamas in Gaza and the prospect of, God forbid, an autocratic, fundamentalist, Islamic organisation taking over in Egypt is obviously not something we can ignore."Mr Gillerman is talking about the Egyptian Islamist movement, the Muslim Brotherhood.
Many analysts would disagree with his description, seeing the Brotherhood as a conservative, but more moderate, Islamic organisation.
But Israel is talking up the threat.