22 Of The Most Powerful Photos Of This Week

An injured woman makes her way through the rubble at a site hit by airstrikes in the rebel-held area of Old Aleppo, Syria.

An elderly woman spreads incense near a grave at sunrise in the village of Copaciu, southern Romania. On Maundy Thursday, during the Holy Week, many Romanians visit the graves of their loved ones, light fires, and share food with community members in memory of the departed.

Colombian astronaut Diego Urbina tests the Gandolfi 2 spacesuit during the Moonwalk project's first Mars mission simulation in the southwestern Spanish town of Minas de Riotinto, Huelva province. The goal of this project is to develop and test technologies and training procedures for future human missions to the moon and Mars.

Knoxville, a trained service dog, sleeps at the feet of retired U.S. Army soldier Stefan LeRoy, who was injured in Afghanistan in 2012, during a U.S. House Military Veterans Caucus briefing for legislation promoting service dogs for military veterans on Capitol Hill in Washington.

A ranger from the Kenya Wildlife Service stands guard near some of around a dozen pyres of ivory, in Nairobi National Park, Kenya. The wildlife service has stacked 105 tons of ivory consisting of 16,000 tusks, and 1 ton of rhino horn, from stockpiles around the country, in preparation for it to be torched on Saturday to encourage global efforts to help stop the poaching of elephants and rhinos.

Alexander Burinin, left, former Chernobyl liquidator, his wife, Olga, and grandson Georg visit Mitino Cemetery in Moscow on the 30th anniversary of the explosion at the Chernobyl nuclear plant. About 600,000 people, often referred to as Chernobyl's "liquidators," were sent in to fight the fire at the nuclear plant after the catastrophic explosion on April 26, 1986.

Sabha al-Wawi, right, comforts her 12-year-old daughter, Dima al-Wawi, after her release from an Israeli prison. Dima was imprisoned by Israel after she confessed to planning a stabbing attack in a West Bank settlement.

A woman visits the "Rain Room" exhibition by the artist collective Random International, bathed in purple light in honor of music icon Prince, at the Los Angeles County Museum of Art.

Solar Impulse 2 flies over San Francisco on Saturday, April 23. The solar-powered airplane, which is attempting to circumnavigate the globe to promote clean energy and the spirit of innovation, arrived from Hawaii after a three-day journey across the Pacific Ocean.

Shinda, a wester lowland gorilla, holds her 5-day-old baby in its enclosure at Prague Zoo in Prague, Czech Republic. According to the Prague Zoo, the birth was unexpected and zoo workers didn't know that 24-year-old Shida was pregnant.

A Dinka girl stands at a cattle camp in Toch, Warrap state in South Sudan. The camp houses over 10,000 Ankoli longhorn cattle and is supported by Veterinaires Sans Frontieres, Germany, who helps the farmers with medicine and vaccines. Food security for livestock and agriculture is at a serious level in South Sudan due to last year's low rains.

Two young boys, who permanently live in the territory contaminated with radionuclides after the Chernobyl nuclear power plant accident, participate in physiotherapy at the children's rehabilitation and health center on the outskirts of Minsk, Belarus.

President Barack Obama and German Chancellor Angela Merkel test virtual reality glasses at the IFM electronics stand at the Hannover Messe industrial trade fair in Hanover, Germany. This is likely Obama's last trip to Germany as U.S. president.

Candidates for the Uttar Pradesh state police, many barefoot and unable to afford running shoes, are seen tagged with chips used to record their distance, waiting for their turn to run during a recruitment drive in Allahabad, India. A state-wide recruitment process has recently been started to fill thousands of vacant police constable posts.

Representatives of Liverpool and Everton football clubs lay a single red rose beside each of the 96 candles outside Liverpool's Saint George's Hall, as thousands of people gather to attend a vigil for the 96 victims of the Hillsborough tragedy in Liverpool, England. The civic commemoration event marks the outcome of the fresh inquests into the 1989 Hillsborough disaster, in which 96 football supporters were crushed to death in large crowds at the Hillsborough football ground in Sheffield, South Yorkshire.

Medieval enthusiasts prepare for the re-enactment of a medieval battle in Libusin, Czech Republic. About 2,000 enthusiasts from Czech Republic and abroad have come to simulate the medieval battle during the 25th annual swordsmen gathering in Libusin village. According to organizers, this battle is the largest of its kind in the Central Europe.

A pilot looks up from a U.S. F-22 Raptor fighter as it prepares to refuel in mid-air with a KC-135 refueling plane over European airspace, during a flight to Britain from Mihail Kogalniceanu air base in Romania.

A police officer reacts during a clash with protesters in Lyon, central France, against the proposed changes to France's working week and layoff practices.

A group of Donald Trump rally attendees walk past anti-Trump protesters following a campaign rally for Republican U.S. presidential candidate Donald Trump at the Klein Memorial Auditorium in Bridgeport, Connecticut.

Wearing masks of the "Bard of Avon," members of the public prepare for the parade marking the 400 years since the death of William Shakespeare, in Stratford-upon-Avon in central England.

An exciting atmosphere of crowds and fireworks is seen during the third day of the Tomorrowland music festival at Parque Maeda, Itu, in São Paulo, Brazil.

A Syrian refugee girl plays outside her home at a tent camp on the outskirts of Izmir, Turkey. For many Syrian refugees, living in Turkey has become their only option. With the new E.U.-Turkey deal effectively shutting down the route to Europe and the war continuing in Syria, many refugees have become stranded and are now looking to make a permanent life in Turkey. However, life is difficult: With limited access to health care and education and without stable housing, many are forced to squat on empty land or in unused buildings.