MEXICO CITY (AP) -- Archaeologists have discovered what they believe
                  to be an ancient religious offering of human and animal bones in a pyramid in
                  the pre-Columbian city of Teotihuacan, Mexico's government news agency
                  reported Saturday.

                  The artifacts were discovered in a pit filled with loose stones inside the
                  Pyramid of the Moon, Notimex said.

                  Archaeologists have been digging a tunnel to the center of the pyramid since
                  last year. Last October, the team, led by Arizona State University
                  archaeologist Saburo Sugiyama, found a skeleton of a man who died about
                  1,800 years ago. He was buried among rich offerings of greenstone
                  figurines, obsidian knives, eagles and jaguars.

                  The latest discovery, made about two weeks ago and announced Saturday,
                  consisted of four human bones, the skeletal remains of cats and birds, snails,
                  dozens of pieces of jade and arrowheads of dark stone, Notimex said.

                  Ruben Cabrera, a leader of the project, was quoted as saying the find was
                  "extraordinary," because it gives archaeologists more information regarding
                  the political and religious significance of the pyramid. Notimex did not say
                  why archaeologists concluded the bones were a religious offering.

                  Teotihuacan, in the valley of the same name 30 miles north of Mexico City,
                  used to be a thriving city and ceremonial center that predated the Aztecs by
                  several centuries.

                  However, very little is known about it -- including what language people
                  who lived there spoke. Teotihuacan began declining sharply around 650
                  AD, and was almost completely abandoned around 750 AD, for unknown
                  reasons.