Israel on Tuesday advised its citizens in Egypt's insurgency-hit Sinai peninsula to leave the region, warning of the threat of an imminent attack.
Israeli holidaymakers are often warned of the risks they face in Sinai, which borders Israel, but the "Level 1" alert issued by the anti-terrorism directorate is its most severe warning.
It described the threat as "very high and concrete".
Militants have launched a number of deadly cross-border attacks on Israel in the past few years and have occasionally fired rockets across the border into the southern Israeli resort city of Eilat.
The anti-terrorism directorate said that while there was a "constant high threat" in Sinai, January 25, the anniversary of the 2011 revolution in Egypt, was a day that had witnessed attacks in previous years.
Israel and Egypt signed a peace treaty in 1978 and the eastern coast of the peninsula is a popular international tourist destination.
(Writing by Ori Lewis; editing by Richard Lough)