The ruins of a forgotten largely African American cemetery were apparently found buried underneath a Florida high school after scans revealed 145 coffins on school property, officials announced Wednesday.
Some 174 skulls were found inside clandestine burial pits in the Gulf state of Veracruz earlier this month.
The names that received the most backlash included Flint Michigan Tap Water, Black Beer Matters and White Guilt.
The men had been working on a construction site near Mosul when they were captured in 2014.
The skeletons are suspected to be those of plague and starvation victims.
Mexican investigators announced the discovery of more than 250 skulls from unmarked graves in the eastern Gulf state of Veracruz.
More than 70 mass-graves have been located in Syria and Iraq since their ISIS occupations.
The pair are believed to have killed 11 people in the Camp Speicher massacre.
Authorities don't know yet how many bodies are in each of the 139 grave sites.
As many as 1,700 bodies could be recovered from the site of the killings near the recently liberated city of Tikrit in northern Iraq.