JERUSALEM, March 7 (Reuters) - Israel has warned its citizens to immediately leave Egypt and Jordan, the only Arab states with which it has full ties, out of concern they could come under attack, a government official said on Wednesday.

The advisory was issued on the recommendation of Prime Minister Ehud Olmert's Counter-terrorism Unit, which this week placed Egypt and Jordan in its highest threat category, alongside enemy states such as Iran, Syria and Lebanon.

Israeli officials gave no further details.

Israeli-Egyptian relations were strained this month over allegations that Israel's armed forces massacred Egyptian prisoners during the 1967 Middle East War. Israel denies it.

Israel has long urged its citizens to avoid resorts in the Egyptian Sinai, where militants have carried out several suicide bombings. The new advisory made clear that Israelis should consider all parts of Egypt unsafe until further notice.

Jordan has a large Palestinian population, which has been aggrieved by Israeli crackdowns on a 6 1/2-year-old Palestinian uprising in the occupied West Bank and the Gaza Strip.

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