National Guard troops stand watch along E. Pratt St. in Baltimore, Maryland, April 28, 2015. REUTERS/Eric Thayer

A man carrying a briefcase walks along the street near collapsed houses after last week’s earthquake in Bhaktapur, Nepal May 2, 2015. REUTERS/Navesh Chitrakar

Britain’s Prince William and his wife Catherine, Duchess of Cambridge, appear with their baby daughter outside the Lindo Wing of St Mary’s Hospital, in London, Britain May 2, 2015. REUTERS/John Stillwell/pool

Nobel Peace Prize laureate Malala Yousafzai waves as she delivers a speech during the Nobel Peace Prize awards ceremony at the City Hall in Oslo December 10, 2014. REUTERS/Heiko Junge/NTB Scanpix/Pool/Files

A masked protester runs away from a water cannon’s jet during May Day clashes with police in Okmeydani neighborhood in Istanbul, Turkey, May 1, 2015. REUTERS/Kemal Aslan

Students wave Vietnamese national flags during a military parade as part of the 40th anniversary of the fall of Saigon in Ho Chi Minh City (formerly Saigon), Vietnam, April 30, 2015. Vietnam marked the 40th anniversary of the capture of Saigon by North Vietnamese forces on April 30, the event that ended a war that lasted 30 years, killing up to four million Vietnamese, the Vietnamese government said, and more than 58,000 U.S troops, the U.S. Department of Defense has said. Vietnam refers to the event as the date of its reunification. REUTERS/Kham

Demonstrators throw rocks at Baltimore police during clashes in Baltimore, Maryland April 27, 2015. REUTERS/Shannon Stapleton

A Nepal Army personnel carries an injured woman to an Indian Airforce helicopter following Saturday’s earthquake in Sindhupalchowk, Nepal, April 28, 2015. REUTERS/Danish Siddiqui

Anita, 14, mourns next to her father’s body after it was recovered by a rescue team from a collapsed building, in the aftermath of Saturday’s earthquake, in Kathmandu, May 1, 2015. REUTERS/Adnan Abidi

A ceremonial town crier announces the birth of a baby girl to royal fans and members of the media outside the entrance to the Lindo wing of St Mary’s Hospital in London, Britain May 2 , 2015. REUTERS/Neil Hall

Soldiers guard supply trucks after local people forced an army truck carrying relief supplies off the road, saying they have not received any government food aid five days after Saturday’s earthquake, near Chautara, Nepal, April 29, 2015. REUTERS/Olivia Harris

A laborer carries bricks at a brick factory on the eve of May Day or Labor Day on the outskirts of Agartala, India, April 30, 2015. REUTERS/Jayanta Dey

Undefeated WBC/WBA welterweight champion Floyd Mayweather Jr. (L) of the U.S. and WBO welterweight champion Manny Pacquiao of the Philippines face off during a final news conference at the MGM Grand Arena in Las Vegas, Nevada April 29, 2015. Leonard Ellerbe (C), CEO of Mayweather Promotions looks on. The champions will face each other in a welterweight unification bout at the MGM Grand Garden Arena on May 2, 2015. REUTERS/Las Vegas Sun/Steve Marcus