Will Chalk

It gives you an idea of the extent, the brutality, the viciousness of the infighting within the Sinaloa cartel at the moment.

Meeting with the cartels is difficult at the best of times, but now even more so because they're right in the crosshairs of the United States and President Trump.

He's labelled them terrorist groups, he says their product, fentanyl and other drugs, are a weapon of mass destruction and he's promised that...

As well as bombing the cartels at sea, he's going to tackle them on land.

So they're feeling under threat like never before.

I'm about to go and meet with a group.

I'm going to have to leave my phone behind.

These men are vicious criminals fighting for an illegal drugs business worth billions.

They've gone to war after the son of one of their leaders betrayed another.

This power struggle is a fight to the death and they show little remorse.

They insisted we disguise their voices.

The civil war in the cartel has created a bloodbath in Culiacan.

Women are being killed.

Kids are being killed.

Do you feel guilty about that?

Yes, a lot of times innocent people die, children die.

There is a lot of death of innocent people.

A lot of people will keep dying because the cartel is still fighting and it's going to keep getting worse.

This war will continue.

Nothing will come down until there is only one faction left.