As Donald Trump was sworn in as the 45th U.S. president, protests, demonstrations — and a few celebrations — were underway in cities around the world.

In London, demonstrators holding anti-Trump signs gathered outside the U.S. Embassy on Friday evening. Earlier in the day, huge banners saying "Build Bridges Not Walls" were hung across the city's bridges, part of a U.K. campaign that that began after Trump was elected in November.

Doctors Without Borders says that the death toll has risen to "about 90" from a Nigerian military airstrike Tuesday on a displaced persons camps in the country's restive Borno state.

Nigerian president Muhammadu Buhari has said that the bombing happened during an operation targeting Boko Haram militants and was accidental.

A British police watchdog is investigating an incident last Saturday in Bristol in which an officer fired a stun gun at a black man who has served as a community-relations adviser for local law enforcement.

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TERRY GROSS, HOST:

For decades, U.S. authorities have been preparing to prosecute one of the world's most feared drug traffickers, known as El Chapo.

Friday, the Justice Department announced charges against Joaquin "El Chapo" Guzman following his extradition from Mexico to the United States. He landed Thursday evening on Long Island, N.Y., and Friday afternoon entered a plea of not guilty at a federal court in Brooklyn.

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