AP Photo/Susan Walsh
President Barack Obama, left, and Mexican President Felipe Calderon, right, walk out onto the South Lawn of the White House in Washington, Wednesday, May 19, 2010, for an arrival ceremony.
AP Photo/Wally Santana
An anti-government protestor piles tires on a fire at a shopping center Wednesday, May 19, 2010, in Bangkok, Thailand. Downtown Bangkok became a raging battleground Wednesday as the army stormed a barricaded protest camp and the Red Shirt leadership surrendered, enraging demonstrators who fired grenades and set fires that cloaked the skyline in a black haze.
AP Photo/Muhammed Muheisen
A Chinese child practices during a self defense course at Changzheng Kung-fu School in Beijing, Wednesday, May 19, 2010. At least five men armed with knives burst into the dormitory of a vocational college Wednesday and slashed nine students, one of them seriously, sparking new fears in a country on edge over a series of shocking rampages at schools.
AP Photo/Alastair Grant
A Christie's employee holds a photograph of Diana, Princess of Wales by Mario Testino, dated 1997, at Christie's auction house in London, Wednesday, May, 19, 2010.
AP Photo/Rajesh Kumar Singh
A Hindu devotee walks down stairs leading to the Ganges River in Varanasi, India, Wednesday, May 19, 2010. Also known as Kashi or Benaras, Varanasi is Hinduism's holiest city, where millions of Hindu pilgrims gather for ritual bathing and prayers.
AP Photo
Flight recorders of the Tu-154 that crashed on April 10 killing Poland's president and 95 others are on display at Russian Interstate Aviation Committee in Moscow Wednesday, May 19, 2010. Officials investigating the plane crash say the crew did not have regular training and that passengers were in the cockpit before the crash.
AP Photo/Harry Hamburg
Actor Sean Penn testifies on Capitol Hill in Washington, Wednesday, May 19, 2010, before the Senate Foreign Relations Committee hearing "After the Earthquake: Empowering Haiti to Rebuild Better."
AP Photo/Pablo Martinez Monsivais
First lady Michelle Obama flexes her muscles as she meets with students during their physical activities class at New Hampshire Elementary School, with Mexican First Lady Margarita Zavala, not shown, Wednesday, May 19, 2010, in Silver Spring, Md.
AP Photo/Jessica Hill
Sgt. 1st Class James Mullan of Plainville, Conn., hugs his wife Kristy, left, and children Brendan, right, and Keegan, center, after arriving home with the 192nd Military Police Battalion of the Niantic, Conn., National Guard unit in Hartford, Conn., Wednesday, May 19, 2010. Soldiers from the battalion maintained the Internment Holding Facility and Tactical Operations Center at Camp Cropper in Iraq.