Secretary of State Antony Blinken says he has spoken to both generals directly. International diplomats are struggling to bring Sudan back from the brink. We're seeing cases where people are staying out in the open, under the trees.' What's at stake in the region and beyond?

The majority of those that are arriving are women and children. That people are essentially coming in exhausted, coming in scared. 'The teams that we have at the border locations, in mainly South Sudan and Chad, tell us they're witnessing a very dire situation. These new arrivals are placing additional strain on these countries that already have public services and resources significantly overstretched,' she says. 'At least 20,000 Sudanese have arrived in Chad and nearly 4,000 South Sudanese refugees have returned to South Sudan.

Tens of thousands are trying to flee to safety, mainly to neighboring Chad and South Sudan, says Faith Kasina, regional spokesperson for the U.N.

Soaring food and fuel prices are exacerbating problems for ordinary Sudanese. People prepare to board a bus departing Khartoum on April 24, as battles rage in the city between the army and paramilitaries.

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