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Overview: On Saturday night, there were separate mass shootings near South Africa's two largest cities.

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air base released on bail, Trump administration rolls back fuel efficiency standards for new vehicles, prosecutors reopen Cornell fraternity rape case.

Trump called an AI "constitution" aimed at self-policing and safety.

Trump and tech leaders sign AI "constitution" with voluntary controls;

CBS News' Lilia Luciano has more.

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Tens of thousands marched through Madrid on Saturday to protest Spain's housing crisis and the eviction of an 87-year-old woman, camping overnight in Madrid's historic Puerta del Sol plaza.

Trump and major AI executives sign "morally binding" voluntary controls

Nancy Cordes has more.

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WATCH: Could laughter be good for your heart?

WATCH: Could laughter be good for your heart?

Jack Smith testifies before the Senate.

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