A campaign against tourism, one of the main sources of foreign revenue, could deal a blow to el-Sissi's promises to repair Egypt's economy.
Tourism has just started to show signs of recovery after plunging in the turmoil since the 2011 uprising that ousted autocrat Hosni Mubarak. The first five months of this year saw tourism revenues up 9 percent from the same period last year, Tourism Minister Khaled Ramy said.
Ramy said he expects the slow recovery to continue despite the attack, and he underscored how police had thwarted it.
“Security forces were there. It's a very important message to everyone,” he told the AP on a flight from Cairo to Luxor.
Mohammed Sayed Badr, the governor of Luxor province, said the attack was “an attempt to break into the temple of Karnak.”
“They didn't make it in,” he said.
But witnesses noted it was civilian bystanders who alerted police to the threat.
Karnak, one of Egypt's biggest attractions, is a giant complex of temples, statues, obelisks and columns built by pharaonic dynasties alongside the Nile. The oldest sections date back nearly 4,000 years.