The bodies of migrants killed after refusing to work for a drug trafficking gang have been found in the state of Tamaulipas.
About 72 migrants were killed last year when a bus filled with passengers was stopped and the people inside were massacred by members of the Zetas drug trafficking gang.
Tamaulipas officials say that 59 corpses have been found, with one grave containing 43 bodies, according to a Los Angeles Times report. In all, 8 mass graves were uncovered.
The Zetas are one of the deadliest gangs in Mexico, known to participate in extortion, migrant-kidnapping and drug trafficking.
Many people on their way to the U.S. from South America or Central America are in danger of being accosted by drug traffickers. It is believed that the busload of migrants refused to work for the gang and were subsequently shot on a ranch in Tamaulipas.
Tamaulipas is at the edge of the Texas border and is a region saturated by violent gangs. The killers are involved in assassinations of political figures as well, such as the death of Rodolfo Torre Cantu, the brother of the governor of Tamaulipas, Egidio Torre Cantu.
The mass graves were found in the San Fernando township, which is about 80 miles away from Mexico's border with Texas, according to the New York Times.
Police are attempting to identify the bodies in order to verify that they were the passengers of the bus. Currently, 11 suspects are in custody following state and federal investigations. Five of the people aboard the bus were rescued but not identified.
The Zetas gang was previously involved in the Gulf cartel. According to the Los Angeles Times, more than 35,000 people are believed to have been killed since 2006 due to drug-trafficking and gang violence.