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Hello and welcome to NewsHour. It's coming to you live from the BBC World Service

Studios in central London. I'm Tim Franks. We're starting the program with the violence

that has flared in Mexico after the killing of the

country's most wanted leader of a drug's cartel.

Nemesio or Sigere Savantes, a 59-year-old former policeman known as El Mentiono, was wounded

in an operation to arrest him in the state of Calisco.

He died while being flown to Mexico City. El Mancho's people

in the Calisco New Generation cartel retaliated by torching businesses and blockading roads with burning

vehicles. The mayhem spread across the country. This video, posted online apparently by cartel members,

shows them shooting at National Guard troops.

It was the sound from Sunday, but by today the Mexican president, Claudius Seimbaum, was trying to project a sense of control.

Today, there is more calm and there is government.

There are armed forces.

There is a security cabinet.

And there is a lot of coordination.

So you can't rest assured that peace, security and normality in the country are being safeguarded.

In a moment we'll hear from the man who used to run international operations

for the Drug Enforcement Administration in the United States

and who spent a lot of time on the trail of the cartels in Mexico.

Before that, we can catch up with our Central

America correspondent, Will Grant, who is in Guadalajara, in Calisco State. Will, can you,

...