What to know this morning: In 5 minutes or less

Everything we're talking about this morning -- what you need to know, in five minutes or less.

1. An Amtrak train that was traveling from Washington D.C. to New York City derailed in Philadelphia last night. At least six people died in the crash, and dozens were injured. The story is developing and an investigation will begin today. Read more here.

2. The U.S. is considering sending military ships and patrols to the South China Sea to challenge Chinese claims to islands it is building there. China reportedly expressed concern, and warned that countries should avoid "risky and provocative approaches to maintain the regional peace and stability." Read more here.

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Disputes over islands in the South China Sea
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What to know this morning: In 5 minutes or less
SUBI REEF, SOUTH CHINA SEA - SEPTEMBER 1, 2015: DigitalGlobe high-resolution imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Image progression. Photo DigitalGlobe via Getty Images.
FIERY CROSS REEF, SOUTH CHINA SEA - SEPTEMBER 3, 2015: DigitalGlobe imagery of the nearly completed construction within the Fiery Cross Reef located in the South China Sea. Fiery Cross is located in the western part of the Spratly Islands group. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - MARCH 17, 2015: DigitalGlobe imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Image progression #2 of 3. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - AUGUST 1, 2015: DigitalGlobe imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Close up image 2 of 2. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - SEPTEMBER 1, 2015: DigitalGlobe high-resolution imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Image progression. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - AUGUST 1, 2015: DigitalGlobe imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Close up image 1 of 2. Photo DigitalGlobe via Getty Images.
Philippine and US Marines aboard riverine patrol boats take position during a beach landing as part of their annual joint naval exercises at a marine base in Ternate, Cavite province, west of Manila on October 8, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said . AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine and US Marines board riverine patrol boats during a beach landing exercise as part of their annual joint naval exercises at a marine base in Ternate, Cavite province, west of Manila on October 8, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said . AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine Marines maneuver during a live fire exercise as part of the US-Philippines annual joint naval exercises facing the South China Sea at a naval training center in San Marcelino, north of Manila on October 9, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
The Philippine Navy's World War II-vintage warship BRP Rajah Humabon is anchored during the navy's founding anniversary celebration at a naval station in Cavite city, west of Manila on May 25, 2015 with buildings along Roxas boulevard in Manila in the background. The Philippine navy is one of the weakest in the region relying mostly on decades-old, surplus US warships, but the Philippine government has been modernising the navy and other branches of the armed forces in the face of China's increasing aggressiveness in trying to claim most of the South China sea. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine Marines take position next to a US Marine assault amphibious vehicles (AAV) during a live-fire exercise as part of the US-Philippines annual joint naval exercises facing the South China Sea at a naval training center in San Marcelino, north of Manila on October 9, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine Marines simulate a beach landing exercise as part of their annual joint naval exercises with the US at a marine base in Ternate, Cavite province, west of Manila on October 8, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said . AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Filipino environmental activists display placards during a rally outside China's consular office in Manila on May 11, 2015, against China's reclamation and construction activities on islands and reefs in the Spratly Group of the South China Sea that are also claimed by the Philippines. The group is accusing China of destroying the fragile ecosystem and livelihood of fishermen during their reclamation project. AFP PHOTO / Jay DIRECTO (Photo credit should read JAY DIRECTO/AFP/Getty Images)
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3. Bill Clinton was a guest on "The Late Show with David Letterman" last night, and coyly said that he'd return to the White House ... if Hillary asked him to. (After she wins the nomination and the election, of course.) Read more and see the clip here.

4. Hundreds are still searching for a missing U. S. Marine helicopter following the second earthquake in Nepal. The helicopter lost contact after its crew was heard talking about fuel problems. There are eight people on board -- six Marines and two Nepali troops. Read more here.

US Helicopter Goes Missing While Aiding Nepal

5. The U.K. has decided it will publish Prince Charles's secret letters to government officials after a long court battle. The public will be able to read the letters, which are referred to as "black spider" memos because of the Prince's handwriting, on Wednesday. Read more here.

30 PHOTOS
Prince Charles and Camilla
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What to know this morning: In 5 minutes or less
WINDSOR, UNITED KINGDOM - APRIL 09: TRH Prince Charles & The Duchess of Cornwall, Camilla Parker Bowles depart the Civil Ceremony where they were legally married, at The Guildhall, Windsor on April 9, 2005 in Berkshire, England. (Photo by Georges De Keerle/Getty Images)
LONDON, ENGLAND - MAY 10: Prince Charles, Prince of Wales leaves the VE Day 70th Anniversary service at Westminster Abbey on May 10, 2015 in London, England. (Photo by Danny E. Martindale/Getty Images)
The Wedding Of Hrh The Prince Of Wales & Mrs Camilla Parker Bowles At The Guildhall, Windsor. (Photo by Mark Cuthbert/UK Press via Getty Images)
The Prince of Wales and his new bride Camilla, Duchess of Cornwall, with their families (L-R back row) Prince Harry, Prince William, Tom and Laura Parker Bowles (L-R front row) Duke of Edinburgh, Britain's Queen Elizabeth II and Camilla's father Major Bruce Shand, in the White Drawing Room at Windsor Castle, after their wedding ceremony. (photo: Anwar Hussein)
Prince Charles and the Duchess of Cornwall, formerly Camila Parker Bowles, arrive at St. Georges Chapel. (photo: Martin Hayhow/PA Archive)
In this handout from Royal Mail an image of a new stamp featuring HRH Prince Charles and Camila Parker Bowles is seen. A series of stamps will be released on the day of the royal wedding in April. The last set of Royal issue stamps was brought out to commemorate Prince William?s 21st birthday in July 2003. (Photo by Royal Mail via Getty Images)
In this handout from Royal Mail a composite image of new stamps featuring HRH Prince Charles and Camila Parker Bowles is seen. A series of stamps will be released on the day of the royal wedding in April. The last set of Royal issue stamps was brought out to commemorate Prince William?s 21st birthday in July 2003. (Photo by Royal Mail via Getty Images)
Britain's Prince Charles and his bride Camila Duchess of Cornwall leave St George's Chapel in Windsor following the church blessing of their civil wedding ceremony, 09 April 2005. In the background is Britain's Queen Elizabeth. Prince Charles married Camilla Parker Bowles, the true love of his life, on Saturday in a private civil ceremony that inevitably paled against his storybook wedding to Princess Diana more than 20 years ago. (Photo credit: ALASTAIR GRANT/AFP/Getty Images)
WASHINGTON, DC - MARCH 19: Charles, Prince of Wales sits as he attends a meeting with United States President Barack Obama (not pictured) in the Oval Office of the White House on March 19, 2015 in Washington, D.C. The Prince and Duchess are in Washington as part of a Four day visit to the United States. (Photo by Ron Sachs-Pool/Getty Images)
JINJA, UGANDA - NOVEMBER 24: HRH Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales pose for a photograph at the source of the White Nile on November 24, 2007 in Jinja, Uganda. The Prince and Duchess are in Uganda during the Commonwealth Heads of Govenment Meeting. (Photo by Chris Jackson/Getty Images)
WINDSOR, ENGLAND - APRIL 09: TRH Prince Charles and his wife The Duchess Of Cornwall, Camilla Parker Bowles meet the crowd following the Service of Prayer and Dedication after their marriage at The Guildhall, at Windsor Castle on April 9, 2005 in Berkshire, England. (Photo by Dave Hogan/Getty Images)
Britain's Prince Charles, Prince of Wales, and his wife Camilla, Duchess of Cornwall, arrive at Andrews Air Force Base in Maryland on March 17, 2015 for a four-day visit to the US.(Photo credit: NICHOLAS KAMM/AFP/Getty Images)
WASHINGTON, DC - MARCH 18: Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales visit the Lincoln Memorial on the second day of a visit to the United States on March 18, 2015 in Washington, DC. The Prince and Duchess are in Washington as part of a Four day visit to the United States. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - MARCH 13: Prince Charles, Prince of Wales speaks with armed forces personnel during a reception at Guildhall, after the Afghanistan service of commemoration at St Paul's Cathedral on March 13, 2015 in London, England. (Photo by Toby Melville - WPA Pool / Getty Images)
LONDON, United Kingdom: FILES - Picture taken 14 November 2002 shows Britain's Prince Charles (R) and his companion Camilla Parker-Bowles leaving the Ritz hotel where a private party was held to celebrate the succes of her jubilee in central London. Prince Charles and Camilla Parker-Bowles will marry in Scotland in the coming autumn, a German royal expert and author said 18 May 2004. (Photo credit: NICOLAS ASFOURI/AFP/Getty Images)
SANDRINGHAM, ENGLAND - JULY 31: Prince Charles and Camilla Parker Bowles arrive together to attend the Sandringham Flower Show on the Royal Sandringham Estate July 31, 2002 in Norfolk, England. Camilla's arrival with Charles, suggests an effort on the part of the British Royal Family to introduce her to more public Royal duties due to her relationship with the Prince. (Photo by Sion Touhig/Getty Images)
GLOUCESTERSHIRE, ENGLAND - JULY 27: Britain's Prince Charles attends a polo match at the Beaufort Polo Club for The Ronnie Wallace Memorial Trophy in aid of The Hunt Servants' Benefit Society July 27, 2002 in Glocestershire, England. (Photo by John Li / Getty Images)
LONDON, UNITED KINGDOM: Britain's Prince Charles (R) and Camilla Parker Bowles (L) leavee the Ritz Hotel after a private party to celebrate the succes of Britain's Queen Elizabeth II jubilee in central London 14 november 2002. (Photo credit:  NICOLAS ASFOURI/AFP/Getty Images)
NORFOLK,ENGLAND - JULY 23: Camilla Parker Bowles meets fans at the Sandringham Flower Show July 23, 2003 at Sandringham in Norfolk, England. (Photo By Steve Finn/Getty Images)
LONDON - JULY 20: Camilla Parker-Bowles enjoys the speech by the Prince of Wales to London black taxi drivers, during a garden reception in the grounds of Clarence House, on July 20, 2004 in London. (Photo by ROTA/Getty Images)
LONDON, UNITED KINGDOM: The Prince of Wales and Camilla Parker Bowles arrive for a charity concert, 11 November 2004 to celebrate the career of music producer Trevor Horn. Charles's partner joined him as he attended the official engagement, titled Produced By Trevor Horn, a concert for the Prince's Trust at London's Wembley Arena. (Photo credit: ANDREW PARSONS/AFP/Getty Images)
WINDSOR, UNITED KINGDOM: Prince Charles and Camilla Parker Bowles arrive for a party at Windsor Castle after announcing their engagement earlier 10 February, 2005. Britain's Prince Charles and his longtime companion Camilla Parker Bowles are to marry, his office announced Thursday, putting the official seal on a relationship that first blossomed 35 years ago. (Photo credit: JOHN STILLWELL/AFP/Getty Images)
WINDSOR, UNITED KINGDOM: Camilla Parker Bowles shows off her engagement ring as she and Prince Charles arrive for a party at Windsor Castle after announcing their engagement earlier 10 February, 2005. Britain's Prince Charles and his longtime companion Camilla Parker Bowles are to marry, his office announced Thursday, putting the official seal on a relationship that first blossomed 35 years ago.  (Photo credit: JOHN STILLWELL/AFP/Getty Images)
GLOUCESTERSHIRE, ENGLAND - MARCH 13: HRH Prince Charles (L) and fiancee Camilla Parker Bowles leave church accompanied by the Rev. Christopher Mulholland, following the Sunday service at St Lawrence Church on March 13, 2005 in Gloucestershire, England. (Photo by Getty Images)
The Prince of Wales, and his new wife, Camilla Parker Bowles, the Duchess of Cornwall (Photo by Anwar Hussein Collection/ROTA/WireImage)
Prince Charles and Camilla Parker-Bowles, Duchess of Cornwall and guests (Photo by Anwar Hussein Collection/ROTA/WireImage)
HRH Prince Charles and Camilla Parker Bowles during The Royal Wedding of HRH Prince Charles and Mrs. Camilla Parker Bowles - Outside at Guildhall in Windsor, Great Britain. (Photo by Anwar Hussein/WireImage)
WINDSOR, ENGLAND - APRIL 09: HRH Prince Charles & The Duchess of Cornwall, Camilla Parker Bowles depart the Civil Ceremony where they were legally married, at The Guildhall, Windsor on April 9, 2005 in Berkshire, England. (Photo by Georges De Keerle/Getty Images)
Prince Charles and Camilla Parker-Bowles, Duchess of Cornwall (Photo by Anwar Hussein Collection/ROTA/WireImage)
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6. A South Korean spy agency said Tuesday that North Korean leader Kim Jong Un publicly executed his defense chief -- reportedly for falling asleep during a meeting and "talking back" to the leader. Read the full story here.

7. A gunman opened fire on a bus in Pakistan that was bound for a Shiite community center, killing 43 people. It's the worst attack Pakistan has seen in months. Read more here.
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