Mexico has a new president, Claudia Sheinbaum. She has a big problem with crime. Some powerful groups called cartels sell drugs and are very violent. They do not follow the country's laws. The president wants to stop them.
In a town in Mexico, there was a brave mayor. The mayor is the leader of a town or city. This mayor, Carlos Manzo, did not like the cartels. He often spoke to the public about the danger. He wanted his town to be safe.
One day, a bad thing happened. The mayor was killed. This was very sad and scary for the people in Mexico. The cartels wanted to show everyone their power. They wanted people to be afraid to speak against them.
President Sheinbaum said she will fight the cartels and find the killers. But this event shows that her job will be very hard. The fight against crime in Mexico is a long and dangerous one.