A man killed one tourist and wounded several others at a Mexican pyramid.
Investigators found materials in his backpack linked to a 1999 U.S. attack, described as a possible reference to the Columbine High School massacre.
A man killed one tourist and wounded several others at a Mexican pyramid.
Investigators found materials in his backpack linked to a 1999 U.S. attack, described as a possible reference to the Columbine High School massacre.