The official, who spoke on condition of anonymity because he was not authorized to talk to reporters, said the new breed of militants were unknown to the authorities. But he said the latest attack was a qualitative shift in the militants' target.
The attack coincided with a major regional
economic summit, hosted by el-Sissi at the Red Sea resort of Sharm el-Sheikh.
Luxor is home to some of Egypt's most famous ancient temples and pharaonic tombs, including that of King Tutankhamun. The city has been one the sites hit hardest by the sharp downturn in foreign visitors since the 2011 uprising.
Before the turmoil, tourism accounted for as much as 20 percent of Egypt's foreign currency revenues, with as a high of 14.7 million visitors in 2010.
After the uprising, those numbers plunged to 9.6 million, and then fell lower in 2013 after Morsi's ouster. Tourists have been coming back slowly, with revenues jumping to $4 billion so far this year, compared with $1.9 billion in the same period in 2014.
Beach resorts in southern Sinai and along the Red Sea coast have drawn most of the visitors, with cultural sites like Luxor seeing only a trickle. Most tourists in the searing heat of the summer months come to Luxor only for a one-day trip from the Red Sea resort of Hurghada.
Wednesday's attack is likely to result in cancellations in bookings for Luxor, although the blow is cushioned by the fact that it is low season and most tourists stay away until October.
Three major German operators, TUI Deutschland, the Germany branch of Thomas Cook and L'TUR, said they are temporarily canceling excursions to Luxor, but stressed that most of their customers are at Red Sea resorts or on Nile cruises.
“We have no reason to advise against traveling to Egypt at the present time, since the German Foreign Ministry hasn't changed its security guidance,” said L'TUR spokesman Thomas Pluennecke. “But, as a precaution, we have stopped all excursions to Luxor. Of course we take the situation seriously.”
