Israel closed its Taba border crossing to Egypt today following a warning by its anti-terrorism office of an "imminent" militant attack there.
The closure comes hours before the start of the Passover holiday, when Sinai is a popular destination for many Israelis.
Soon after the announcement, sirens wailed in parts of southern Israel alerting residents to a rocket attack. The military said a rocket fired from Sinai exploded in an open field, causing no injuries.
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The border closure comes a day after militants in Egypt bombed two churches, killing dozens of Christian worshippers during Palm yesterday ceremonies. In the wake of those attacks, Israel's anti-terrorism office called on all Israeli tourists in Sinai to return home immediately and asked Israelis planning trips to the Sinai to cancel.
The Israeli government statement says that intelligence information shows "increased activity by Islamic State militants" in Sinai. It adds that with the Islamic State group losing ground in Iraq and Syria, there is renewed "motivation to carry out terror attacks in different arenas at this time."
Southern Sinai, with its pristine beaches and Red Sea coral reefs, has traditionally been a popular Israeli tourist destination, especially for secular Israelis during the Passover holiday that starts today evening.
But tourism there has declined since 2013, when the Egyptian military overthrew an elected Islamist president and an Islamic insurgency based in northern Sinai intensified.
Israel issues travel recommendations from time to time based on intelligence reports. Today's travel warning was rare in its urgency.
Israel signed a peace treaty with neighboring Egypt in 1979.
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