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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. One of our jobs as journalists is to bear witness.

So when the path is blocked or when it's simply too dangerous to get somewhere, that can be frustrating.

Think recently of Gaza or Myanmar.

Think now of Sudan.

The site of the world's worst humanitarian catastrophe and reports of appalling atrocities,

possibly genocidal in their scale, in the

west of the country, in Darfur, as forces from the paramilitary RSF finally overran the city of El Fasher

in their two-and-a-half-year-long war against the Sudanese National Army. But when we can't be

there ourselves, we can revisit the people and the

incidents, and we can hear from those caught in the maelstrom. And so it may seem odd to start the

programme with an event which happened last month, but our Africa correspondent, Barbara Plet Usher,

has been doggedly gathering evidence of what the UN says was the mass killing

of about 500 patients and staff at the Saudi hospital in El Fasher.

Muhammad Abd U.Tiyah was in hospital the day El Fasher fell to paramilitary troops.

He'd been injured by shelling.

Yet even with a broken leg, he managed to flee the city on foot,

eventually making it to the town of Toila,

stopped by the RSF, but not detained, like many others.

They didn't beat me, but they questioned me a lot because of my injury, I think.

They said, we know you're a soldier, but you're finished.

...