Sudanese fishermen wash their day's catch by the Nile River bank at dawn, after an overnight fishing trip, in Khartoum, Sudan, Thursday, April 16, 2015.
Kremlin guards perform at the Cathedral Square during a ceremony of the Changing of the Guard in the Kremlin, in Moscow, Russia, Saturday, April 18, 2015.
Visitors walk at the historical Taragarh Fort overlooking the city on the eve of World Heritage Day at Ajmer, in the western Indian state of Rajasthan, Friday, April 17, 2015.
The Calbuco volcano is seen erupting from Puerto Varas, Chile, Wednesday, April 22, 2015. The volcano erupted billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile. Authorities ordered the evacuation of the inhabitants of the nearby town of Ensenada, along with residents of two smaller communities.
In this Saturday, April 4, 2015 photo, Vietnamese-American Jillian Nguyen, 3, stands with others during their baptism into the Catholic faith, at Saint Helena Catholic Church in Philadelphia. When Pope Francis visits Philadelphia in September, after stops in Washington and New York, the crowd that gathers to hear the papal Mass will look different from the one that greeted Pope John Paul II in 1979. The Catholic population has been buoyed by new immigrants, including from Mexico, the Philippines and Vietnam.
Caroline Rotich, of Kenya, breaks the tape to win the women's division of the Boston Marathon, Monday, April 20, 2015, in Boston.
Afghan day laborers work at a brick factory as the sun sets, on the outskirts of Kabul, Afghanistan, Monday, April 20, 2015. The men generally work eight hours a day, six days a week, and make about 350 Afghani ($6) per day.
In this photo taken on Friday, April 17, 2015, fire and smoke rises after a Saudi-led airstrike on Sanaa, Yemen. Iran's foreign minister urged U.N. Secretary-General Ban Ki-moon on Friday to try to end "the senseless aerial attacks" in Yemen by a Saudi-led coalition and establish a cease-fire.
Small silvery fish called twaite shad float in the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Thursday, April 16, 2015. Fish continued to die by the ton Thursday in the Rio de Janeiro lagoon that's slated to host Olympic rowing events, while city authorities and biologists argued about the cause of the die-off.
People take part in the Color Run near the Eiffel Tower, in Paris, France, Sunday, April 19, 2015. The Color Run is a 5 kilometer (3.1 mile) running event where participants are covered in bright colored powder at each check station and is less about speed and more about enjoying a day with friends and family.
Kremlin guards perform at the Cathedral Square during a ceremony of the Changing of the Guard in the Kremlin, in Moscow, Russia, Saturday, April 18, 2015.
Visitors walk at the historical Taragarh Fort overlooking the city on the eve of World Heritage Day at Ajmer, in the western Indian state of Rajasthan, Friday, April 17, 2015.
The Calbuco volcano is seen erupting from Puerto Varas, Chile, Wednesday, April 22, 2015. The volcano erupted billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile. Authorities ordered the evacuation of the inhabitants of the nearby town of Ensenada, along with residents of two smaller communities.
In this Saturday, April 4, 2015 photo, Vietnamese-American Jillian Nguyen, 3, stands with others during their baptism into the Catholic faith, at Saint Helena Catholic Church in Philadelphia. When Pope Francis visits Philadelphia in September, after stops in Washington and New York, the crowd that gathers to hear the papal Mass will look different from the one that greeted Pope John Paul II in 1979. The Catholic population has been buoyed by new immigrants, including from Mexico, the Philippines and Vietnam.
Caroline Rotich, of Kenya, breaks the tape to win the women's division of the Boston Marathon, Monday, April 20, 2015, in Boston.
Afghan day laborers work at a brick factory as the sun sets, on the outskirts of Kabul, Afghanistan, Monday, April 20, 2015. The men generally work eight hours a day, six days a week, and make about 350 Afghani ($6) per day.
In this photo taken on Friday, April 17, 2015, fire and smoke rises after a Saudi-led airstrike on Sanaa, Yemen. Iran's foreign minister urged U.N. Secretary-General Ban Ki-moon on Friday to try to end "the senseless aerial attacks" in Yemen by a Saudi-led coalition and establish a cease-fire.
Small silvery fish called twaite shad float in the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Thursday, April 16, 2015. Fish continued to die by the ton Thursday in the Rio de Janeiro lagoon that's slated to host Olympic rowing events, while city authorities and biologists argued about the cause of the die-off.
People take part in the Color Run near the Eiffel Tower, in Paris, France, Sunday, April 19, 2015. The Color Run is a 5 kilometer (3.1 mile) running event where participants are covered in bright colored powder at each check station and is less about speed and more about enjoying a day with friends and family.