Mexico has a long history of UFO activity, comparable to that of the rest of the world. In the 1990s, however, sightings increased quite dramatically. In Spanish, the acronym is OVNI (objeto volante [or volador] no identificado). A great resource for info on Mexican OVNI activity is Ana Luisa Cid's website: http://analuisacid.com The site is in Spanish, but has a translation feature which yields fairly comprehensible results in English and other languages.
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