The bones of about 20 people discovered in an ancient Mexican well in 2013 are revealing their gruesome secrets.

The remains, which were found by archaeologists from Germany’s University of Bonn at the former Maya city of Uxul, belong to people who were killed and dismembered about 1,400 years ago, according to experts.

Scientists from the University of Bonn and the National Autonomous University of Mexico (UNAM) have analyzed the bones. Nicolaus Seefeld, Ph.D., who leads the project for the University of Bonn, took small samples of tooth enamel from 13 of the individuals at Uxul during the summer. "Unfortunately, it was not possible to examine the strontium isotope ratio of the remaining individuals, because the teeth were too decayed and the result would have been distorted," he said in a statement.

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Researchers at UNAM performed isotope analysis on the enamel to reveal that the victims grew up in an area 95 miles from Uxul, in what is now Guatemala. "However, at least one adult and also one infant were local residents from Uxul," Seefeld added in the statement.

Most of the remains belonged to people of high social status, according to the research, which notes that eight individuals had “elaborate jade tooth jewelry” or engravings in their incisors.

The mass grave contained the remains of at least 14 men and one woman, as well the remains of a number of adolescents and an 18-month-old. “Nearly all the bones showed marks of cuts and injuries by stone blades. Their regular distribution clearly shows that the individuals had been systematically and deliberately dismembered,” said the University of Bonn in the statement. “The victims were killed and decapitated outside the water reservoir, then dismembered and the body parts placed at the bottom of the reservoir.”

Once placed in the well, the remains were covered with large stones.

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Citing the isotope analysis, experts believe that most of the victims were prisoners of war from a city in the southern Maya lowlands that was defeated by the city of Uxul. They were then brought to Uxul, where they were killed and dismembered.

After the dismemberment, body parts that had previously been connected were placed as far apart from each other as possible. "This clearly demonstrates the desire to destroy the physical unity of the individuals," said Seefeld.

The Maya empire continues to reveal its secrets. In a separate project, earlier this year experts discovered a unique ancient tool that was used by Maya salt workers more than 1,000 years ago.

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In addition to this, last year an ancient mask depicting a 7th-century Maya king was discovered in southern Mexico.

Also in 2018, archaeologists harnessed sophisticated technology to reveal lost cities and thousands of ancient structures deep in the Guatemalan jungle, confirming that the Maya civilization was much larger than previously thought.

LiveScience reports that hundreds of Maya artifacts that may have been used in ritual animal sacrifices have also been discovered at the bottom of a Guatemalan lake.

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From its heart in what is now Guatemala, the Maya empire reached the peak of its power in the sixth century A.D., according to History.com, although most of the civilization’s cities were abandoned around 900 A.D.

The Associated Press contributed to this article. Follow James Rogers on Twitter @jamesjrogers