(CNN) -- A hot air balloon ride on a lovely Egyptian day -- 86 degrees, sunny, light wind -- turned tragic Tuesday when the balloon exploded and plummeted to the ground, killing 19 people.
It was the deadliest hot air balloon accident in the world in at least 20 years.
Tourists who have taken similar rides over southern Egypt marvel over the vantage point from the air -- a beige desert valley giving way to green farmland.
A gas explosion caused the crash, state-run EgyNews reported.
Passengers in the balloon included 19 foreign tourists: nine from Hong Kong, four from Japan, three from Britain, two from France and one from Hungary, officials said.
An Egyptian pilot and another Egyptian were also on board, Luxor province spokesman Badawi al-Masri said.
Three people -- two Britons and the pilot -- are hospitalized.
Balloon rides offering panoramic aerial views of the Nile River and the ancient temples of Karnak and Hatshepsut are a popular tourist attraction in Luxor, about a nine-hour drive southeast of Cairo.
"You can see Valley of the Kings in the background bordered by farmland," Pauline Liang of Vancouver, Canada, told CNN's iReport last year. "Below were banana farms, and behind us was the city of Luxor. There was a great contrast between desert landscape, lush farmland and urban development."
Tuesday's crash prompted Gov. Izzat Saad of Luxor province to ban all hot air balloon flights until further notice.
The last hot air balloon accident in Luxor occurred in 2009, when 16 foreign tourists were injured after a balloon struck a cell phone transmission tower.
Until Tuesday's incident, the deadliest accident in recent memory took place in 1989, when 13 people were killed after two hot air balloons collided in Australia.
Egyptian government spokesman Alaa Hadidi announced that the Cabinet will form a committee from the Ministry of Civil Aviation to investigate the cause of Tuesday's accident, EgyNews said.