Police went after a cartel leader. His name is Nemesio Oseguera Cervantes. He is called "El Mencho." He leads a big cartel called CJNG.
The police raid hurt "El Mencho." He was flying for help. Cartel members got angry. They caused a lot of violence.
On Sunday, cartel men blocked roads. They used burning cars. People were scared. They also attacked a prison. They helped 23 people escape.
Many people died. This includes cartel members and police. Over 70 people died in all.
Businesses closed. People stayed home. Flights were stopped. This will hurt the economy.
The president wants people to be safe. Mexico will host World Cup games. The government is working to stop the violence. Roadblocks are gone now. But the cartel is still a threat.