They also called on fighters to kidnap foreign tourists to embarrass the Egyptian government and damage the tourism industry.
ISIS made the call in an online weekly publication – Al-Nada – urging operatives to intensify their attacks on Christians across the country.
Egypt’s tourism industry has taken a hammering over the last few years after an increased terror threat.
But now UK tour operators have begun flying back into the popular Sharm el Sheikh resort.
Travel to the Egypt largely stopped after a Russian holiday jet was downed in 2015 killing all 224 people on board.
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But now, ISIS is trying to destabilise the government ahead of elections next month.
ISIS controls areas of the Sinai region, north of the resort.
Al-Naba, a weekly online publication, has allegedly explicitly threatened attacks on “belligerent” Christians and tourists in Egypt.
Middle East monitoring group MEMRI revealed one ISIS supporter in the region wrote on the messaging channel Telegram telling followers to embarrass the Egyptian authorities.
Despite lifting a ban on travel to the area, the Foreign and Commonwealth Office still warns a terror attack in the country is “very likely”.
Guidelines say: “Terrorists are very likely to try to carry out attacks in Egypt.
“The main threat is from extremists linked to Daesh-Sinai. You should avoid crowded places and gatherings, eg, in or around religious sites and during religious festivals.”
It advises avoiding all but essential travel to or from Shame el Sheikh.
The FCO says “terrorists are very likely to try to carry out attacks in Egypt”.
Foreign Office guidelines state: “You should be vigilant at all times, avoid crowded places and follow the advice of the Egyptian authorities and your travel company, if you have on
Egypt is to hold presidential elections at the end of March.
Current President Abdel Fattah al-Sisi has announced he will run for a second term in office, which the former military commander is widely expected to win.
Mr al-Sisi’s rule has brought some stability to the country, but critics say his popularity has been eroded by tough economic reforms that have hit people’s livelihood’s hard and by a crackdown on dissidents.
His supporters on the other hand say measures are needed to keep the country stable as it faces security challenges including attacks by ISIS militants in the North Sinai region.