Israelis have been warned to leave Egypt's Sinai Peninsula immediately.
Israel's Counter-Terrorism Bureau on Tuesday evening issued the warning, citing "concrete information" that terrorists were planning to kidnap Israelis.
"We call on all Israelis now in Sinai to leave at once and return to Israel," read the warning. "Families of Israelis now in Sinai are requested to make contact and update them of this travel warning."
The bureau had called Sinai a travel destination with a "very high and concrete threat" in a travel warning list released a month before Passover.
There was a 36 percent increase in the number of Israeli traveling to Sinai during the Passover holiday season, Israel's Airport Authority reported.