Russian Alexander Tretyakov hits the padding at the end of his second heat in the Men's Skeleton during the Vancouver 2010 Winter Olympics in Whistler, British Columbia, on Feb. 18. Jim Young/Reuters
A boy looks through a grenade launcher during Army Day celebrations in Tijuana, Mexico, on Friday. Guillermo Arias/AP
US Army Pvt. Michael Lemay of Halifax, Mass., holds his godson Thomas following a departure ceremony for soldiers of the Massachusetts National Guard's 379th Engineer Company in Brockton, Mass., on Feb. 19. Approximately 165 soldiers attended the ceremony before the start of their yearlong deployment to Afghanistan. Gretchen Ertl/AP
Tiger Woods hugs his mother Kultida Woods after making a statement at the Sawgrass Players Club on Friday in Ponte Verda Beach, Fla. Joe Skipper/AP
The sun sets over Soccer City Stadium on the edge of Soweto and against a backdrop of the city in Johannesburg, South Africa, on Feb. 19. The stadium will host the opening and closing matches of the FIFA 2010 World Cup Soccer Tournament which begins in under 100 days. Denis Farrell/AP
A man drives his motorcycle through a flooded street under heavy rain in Buenos Aires, Argentina, on Friday. Natacha Pisarenko/AP
First Lady Michelle Obama and Philadelphia Mayor Michael Nutter are seen at Fairhill Elementary School in Philadelphia, Pa., on Feb. 19 as part of 'Lets move,' her initiative to combat childhood obesity in the US. Matt Rourke/AP
Aksel Lund Svindal of Norway reacts after finishing in the Men's Alpine Skiing Super-G race at the Vancouver 2010 Winter Olympics in Whistler, British Columbia, on Friday. Wolfgang Rattay/Reuters
New York Yankees manager Joe Girardi stretches on the field as pitchers and catchers worked out at Steinbrenner Field in Tampa, Fla., on Friday. Kathy Willens/AP
Danica Patrick prepares to practice for the NASCAR Nationwide Series Stater Bros. 300 car race at Auto Club Speedway in Fontana, Calif., on Feb. 19. Danny Moloshok/Reuters
Firefighters and investigators look around the site of an airplane crash in Austin, Texas, on Friday. Joseph Stack flew his small plane intothe building on Thursday, which houses office of the Internal Revenue Service. Tony Gutierrez/AP
Finland's Matti Hautamaeki makes his qualification jump during the Men's Large Hill Ski Jumping qualification round at the Vancouver 2010 Winter Olympics on Friday. Dmitry Lovetsky/AP
Earlier Sunday, the international medical charity said it had withdrawn from the northern Afghan city of Kunduz after deadly airstrikes to its hospital.
ByLolita C. Baldor, Associated Press
Médecins Sans Frontières
U.S. Defense Secretary Ash Carter is promising a full and transparent investigation into whether a U.S. aircraft providing air support for American and Afghan special operations forces in Afghanistan was responsible for the explosions that destroyed a hospital and killed 22 people.