Hello and welcome to the explanation from the BBC World Service.

This is where we press polls on the busy 24-hour news cycle and dig a bit deeper behind the headlines.

Today the West Bank's night pass started coming true.

Protest is trying to bricks in there, using bamboo poles to smash vehicles.

It's a city where mothers carry guns along with their groceries.

The spaces that people can run to for safety are shrinking every day here.

I'm Claire Graham and with the help of my BBC colleagues around the world,

I'll be trying to get a better understanding of the stories that matter to all of us.

Today, Boko Harab, high Islamic fundamentalism, took hold in Northern Nigeria.

Please note you may find some of the details in this programme of selling.

My Annie Jones became the BBC's correspondent in Nigeria in 2019.

Welcome to the explanation.

My Annie, thank you very much for joining us.

Thanks for having me, Claire.

Where I really want to start is just a chat about the lay of the land with this.

Can you explain to me how the country is divided along those religious and social lines?

Because geography plays its part in this story, doesn't it?

Yes, it certainly does.

Roughly speaking, Nigeria is split in half with the southern part of the country,

being the kind of wealthier, predominantly Christian part.

Even in terms of its vegetation, it looks very different.

It's very green, very humid.

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