A shooting at the Teotihuacán pyramids north of Mexico City left one Canadian tourist dead and six others injured Sunday before the gunman took his own life.

The attack happened at the nearly 2,000-year-old archaeological site, a popular tourist destination about one hour north of Mexico City. The gunman opened fire from atop the Pyramid of the Moon.

Local authorities said four people were wounded by gunshots and two were injured from falls. The injured tourists included Colombian, Russian, and Canadian nationals.

The shooter later died from a self-inflicted gunshot wound, according to a statement from local government.

The incident raises questions about security at major archaeological sites that draw thousands of international visitors. Teotihuacán features massive stone pyramids and draws tourists from around the world to walk among structures built nearly two millennia ago.

Authorities have not released the identities of the victims or the shooter. No motive for the attack has been disclosed.