Krishnadev Calamur

Britain reportedly has withdrawn its remaining special forces from Yemen, days after a similar U.S. move, in response to the worsening security that the U.N. envoy for Yemen described as the "edge of civil war."

The reported development comes as Yemeni Foreign Minister Riyadh Yaseen called on his Arab neighbors to intervene militarily to stop the inroads made by Shiite Houthi fighters in the predominantly Sunni Muslim country.

Paris has banned cars with license plates ending in even numbers from its roads today to reduce smog that last week briefly made the City of Lights among the world's most polluted places.

NPR's Eleanor Beardsley, who is reporting on the story for our Newscast unit, says the Paris Metro and other public transportation are free for the next few days to encourage people to use them. The ban on cars doesn't extend to electric, hybrid or emergency vehicles.

Sen. Ted Cruz, R-Texas, announced his bid for the presidency with a tweet early Monday morning, becoming the first major Republican to declare that he is running.

Updated at 12:50 p.m. ET

SpaceX has put all of its images in the public domain — as the result of a tweet.

CEO Elon Musk tweeted Saturday:

Among the responses was this one:

Musk's reply:

SpaceX posted new images on its website and on Flickr. The decision puts SpaceX in the company of NASA, which also has its images in the public domain.

Update at 2:25 p.m. ET. Investigation Suspended:

The police department in Charlottesville, Va., says it has suspended its investigation into allegations of a brutal gang rape at the University of Virginia in 2012.

The allegations came to national prominence after Rolling Stone published a cover story on the case.

The House committee that's investigating the 2012 attack on the U.S. consulate in Benghazi, Libya, has formally asked Hillary Clinton to turn over her email server after it emerged that she used a personal email account during her tenure as secretary of state.

John Urschel is an offensive lineman for the NFL Baltimore Ravens whose Twitter handle is @MathMeetsFball. He has bachelor's and master's degrees in math, both with a 4.0 grade-point average. And this week he tweeted:

Now, journalists are notoriously poor at math (or at least this one is), so we'll provide a link to the paper. And for those of you who are mathematically inclined, here's the abstract:

Gen. David Petraeus, who commanded the U.S.-led coalition forces in Iraq, says the "foremost threat to Iraq's long-term stability" is not the self-described Islamic State but Shiite militias backed, and sometimes guided, by Iran.

New York City medical examiners have identified the remains of another of the victims of the attacks on the World Trade Center on Sept. 11, 2001. He is Matthew David Yarnell of New Jersey, a 26-year-old vice president of technology of the Fiduciary Trust Co.

NPR's Hansi Lo Wang tells our Newscast unit that Yarnell worked on the 97th floor of the World Trade Center's south tower. His remains were identified through DNA testing.

A New York state judge has refused to release grand jury testimony about the death last year of Eric Garner on Staten Island.

Garner, 43, died in July after being placed in a chokehold as he was being arrested for selling loose cigarettes on the sidewalk. A grand jury decided in December not to indict the police officer involved in the death.

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