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The fighting in Yemen has expanded from the major cities and ports to a border region with Saudi Arabia. Shelling by Shiite Houthi rebels in the area of Najran in northwestern Yemen has forced Saudi Arabia to suspend school and halt flights into the local airports, according to news reports.

This latest flashpoint comes nearly six weeks into a Saudi-led air campaign to stop the Houthis and their allies, security forces loyal to ousted President Ali Abdullah Saleh, from taking control of Yemen.

Updated at 2:50 p.m. ET

Attorney General Loretta Lynch is in Baltimore Tuesday where she met with the family of Freddie Gray, the black man whose death led to riots in the city and charges against six police officers.

"This is a flashpoint situation," Lynch told a group of officials after she met privately with Gray's family. "We lost a young man's life and it begins to represent so many things."

Infections with the bacteria Clostridium difficile are a big problem, killing 29,000 people a year. Many of those people got infected while in the hospital. And antibiotics often don't work.

So how about this: Take spores from a harmless version of C. difficile and use them to fight off the bad bugs?

That's just what researchers at the VA hospital in Hines, Ill., did.

Former Arkansas Gov. Mike Huckabee announced Tuesday that he is seeking the Republican presidential nomination.

"It seems perfectly fitting that it would be here that I announce that I am a candidate for president of the United States of America," he told a crowd of supporters in his hometown of Hope, Ark., which is also Bill Clinton's hometown.

Huckabee, who previously ran for the presidency in 2008, hosted a television program on Fox News until January, when he ended the eponymous show to consider his political future.

Lately, Californians have been focused on a measles outbreak that got its start at Disneyland. But in the past five years, state health officials have declared epidemics of whooping cough twice — in 2010 and in 2014, when 11,000 people were sickened and three infants died.

When you talk to the people of west Baltimore, you'll hear a lot about how bleak the future looks for the children from that part of the city. The protests were certainly driven by the issue of policing, but they were also informed by the tough economic conditions of west Baltimore.

In New York City, supporters of public libraries say that respect for — and repair of — the libraries is long, well, overdue.

A new campaign, Invest in Libraries, puts forth that in the past 10 years, the city government has reduced funding for public libraries by nearly 20 percent and 1,000 workers or so have been trimmed from the payroll. The campaign calls on the city to increase its support in various ways, such as restoring $65 million in operating funds.

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Transcript

STEVE INSKEEP, HOST:

This next story will test the ability of the British to keep calm and carry on.

DAVID GREENE, HOST:

London is the home of a new work of art. It is part of a competition.

INSKEEP: It's outdoors.

(Updated at 12:09 p.m. ET.)

President Obama has nominated Marine Gen. Joseph Dunford Jr. as the country's next chairman of the Joint Chiefs of Staff.

Speaking at the White House, Obama praised Dunford as one of the most admired officers in the military.

Dunford, 59, is currently the commandant of the U.S. Marine Corps. Previously, he served as the commander of the allied forces in Afghanistan and he commanded the 5th Marine Regiment during Operation Iraqi Freedom.

John Kerry became the first United States secretary of state to visit Somalia when he landed in Mogadishu on Tuesday for an unannounced visit.

NBC News reports:

"The secretary of state was greeted upon arrival in Mogadishu by Somalia's President Hassan Sheikh Mohamud, who called the visit 'a great moment' for his nation.

" 'I'm glad to be here,' Kerry said, asking if the president had spent a 'long time' waiting for his arrival.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

STEVE INSKEEP, HOST:

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

DAVID GREENE, HOST:

The self-declared Islamic State is taking credit for a thwarted attack on a contest to draw the Prophet Muhammad in Garland, Texas.

New York University student Joo Won-moon, who's a South Korean citizen, says he's healthy and being treated well in North Korean custody, according to an interview he gave CNN on Tuesday.

Joo, 21, acknowledged he crossed the border into North Korea illegally, out of hopes for a "great event" to help strengthen ties between diplomatic rivals North and South Korea.

This post was updated at 11:40 a.m. ET.

Meet Mike Huckabee, former Arkansas governor. Forget about Mike Huckabee, Fox News host.

That's the message the GOP presidential hopeful is already conveying as he makes another bid for the presidency.

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