Mexico's National Institute of Anthropology and History (INAH) said a further 119 skulls had been uncovered.
The tower was discovered in 2015 during the restoration of a building in the Mexican capital.
Mexico's National Institute of Anthropology and History (INAH) said a further 119 skulls had been uncovered.
The tower was discovered in 2015 during the restoration of a building in the Mexican capital.