Tourism operators are keeping a close watch over Cairo, where violent demonstrations against Egyptian President Hosni Mubarak's 30-year rule continue to shake up the capital city.

Many vacation-goers who booked travel to the popular destination are wondering if it is safe to travel to Egypt. So far, protests have stayed far away from popular tourism sites just outside of Cairo -- such as the Pyramids of Giza and the Great Sphinx -- but travel operators remain on high alert.

MSC Cruises has altered the upcoming calls on several of the company's ships to avoid Alexandria, diverting ships "[d]ue to the escalating violence in Egypt and for the safety of our guests." Travel giant Thomas Cook, a popular tourism operator in Britain, cancelled all of its excursions to Cairo as a precautionary measure. As the violence continues, more operators may follow suit.

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