40 skulls found in the den

Police found more than 40 skulls, dozens of bones and a fetus in a glass jar in the den of drug traffickers in Mexico City during a raid this week.

Police arrested 31 people on suspicion of drug cartel activity.

In the den, Investigators found a painted wall full of symbols that included a pyramid.They are also discovered knives, 40 jaw bones at the site.

Tepito, Northern section in the Mexico city, has long had a reputation as a place of illicit commercial activity.