Justin Nelzen, in red vest, joins others as they work to rescue up to 70 horses near Humble along Cypress Creek, on April 18, 2016, in Houston. More than a foot of rain fell Monday in parts of Houston, submerging scores of subdivisions and several major interstate highways, forcing the closure of schools and knocking out power to thousands of residents who were urged to shelter in place.
Police stand guard as a polio vaccination team works in Karachi, Pakistan, on April 21, the day after seven policemen who were guarding a polio vaccination team were killed in the city by unknown gunmen.
Pakistan and Afghanistan are the last two countries where polio is still endemic. Though new polio cases dropped to a nine-year low in 2015, attacks by Islamist militants against health workers and police guarding them remained a challenge for a U.N.-funded vaccination campaign. Only 51 children were found infected with the crippling virus in 2015, compared to 306 a year earlier.
Maria Victoria, 89, is comforted by her daughter Mariana in Estancia Las Palmas, Ecuador, on April 19. Victoria was injured when a column fell on her after a 7.8-magnitude earthquake collapsed her home. The strongest earthquake to hit Ecuador in decades flattened buildings and buckled highways along its Pacific coast, sending the Andean nation into a state of emergency.
A picture made available on April 20 shows Spanish soldiers of the 7th Airborne Light Infantry Brigade 'Galicia' fire a howitzer Light Gun L118 during maneuvers with other units from the Training Center 'San Gregorio' in preparation for NATO's Very High Readiness Joint Task Force (VJTF) in Zargoza, Spain, on April 19.
Frankie Dettori celebrates after riding So Mi Dar to win The Investec Derby Trial at the Epsom racecourse on April 20 in Epsom, England.
A man climbs out of a crack after taking some pictures of a section of highway that collapsed in Chacras, Ecuador, on April 19. The strongest earthquake to hit Ecuador in decades flattened buildings and buckled highways along its Pacific coast, sending the Andean nation into a state of emergency.
Britain's Prince William and his wife Catherine, the Duchess of Cambridge, pose as they sit in front of the Taj Mahal in Agra, India, on April 16. William and Kate sat side by side on the same bench where his late mother was photographed on a solitary visit in 1992.
A firefighter responds to a fire at an auto wrecking yard in the Sun Valley section of Los Angeles as a huge plume of thick, black smoke rises over them on April 17. The fire department said the blaze at Self Service Auto Recycler in Sun Valley engulfed at least 15 vehicles.
Charles Ellis looks at his neighbor's car that was engulfed when the roadway collapsed due to heavy rains on April 18. Widespread storms producing heavy amounts of rainfall hammered central Texas communities like La Grange, resulting in widespread flooding and numerous road closures.
A resident stands in front of a damaged house in Mashiki, Kumamoto prefecture, southern Japan, on April 16. A powerful earthquake struck southern Japan early Saturday, barely 24 hours after a smaller quake hit the same region.
The Week in Pictures: April 7 - 14