MEXICO CITY (AP) — Mexico’s government said it was beefing up security at tourist sites after a man opened fire on tourists at pyramids outside of Mexico City less than two months before the FIFA World Cup.

A gunman opened fire at the Teotihuacán archaeological site outside Mexico City before killing himself, the authorities said. Six Americans were among those injured, including two from gunshots.

A new computational study suggests the Great Pyramid of Giza was built using a sophisticated "Integrated Edge-Ramp" (IER) system, potentially solving a 4,500-year-old architectural enigma. This model challenges traditional theories of massive external ramps or complex internal spirals,

The deadly shooting at a popular tourist site weeks before the World Cup has rocked Mexico.