22 Of The Most Powerful Photos Of The Week

One hundred Amnesty International activists dressed as the Statue of Liberty protest outside the US Embassy in London to mark President Donald Trump's first 100 days in office.

Archer Somodevilla, son of Getty Images photojournalist Chip Somodevilla, photographs Speaker of the House Paul Ryan's weekly news conference in the Capitol on April 27, Take Our Daughters and Sons to Work Day.

A man looks on as opposing factions gather over the cancellation of conservative commentator Ann Coulter's speech at the University of California, Berkeley, on April 27.

A protester shows her support of science during the March for Science in Seattle on April 22.

Credit Suisse Chairman Urs Rohner and CEO Tidjane Thiam look up as activists of the environmental group Greenpeace unveil a banner to protest against the financing of the Dakota Access Pipeline during the Swiss bank's annual shareholder meeting in Zurich on April 28.

California "weed nun" Christine Meeusen, 57 (right), and India Delgado, who goes by the name Sister Eevee, smoke a joint at Sisters of the Valley near Merced, California, on April 18.

Matthew Rees of Swansea Harrier (left) helps an ailing David Wyeth of Chorlton Runners (center) down The Mall to finish the Virgin Money London Marathon on April 23.

German Chancellor Angela Merkel shakes hands with a mascot called "Little Czar" during an election campaign event of her Christian Democratic Union (CDU) party in Sierksdorf, Germany on April 28. A regional election will be held in the German federal state of Schleswig-Holstein to elect a new parliament on May 7.

Pharmacist Tiffany Brown laughs as she relates her first experience meeting former president Barack Obama during a forum at the University of Chicago held on April 24 to promote community organizing. The visit marked Obama's first formal public appearance since leaving office.

Supporters of French centrist presidential election candidate Emmanuel Macron celebrate after the results of the first round of the presidential election on April 23 at the Parc des Expositions in Paris. Macron and far-right leader Marine Le Pen will square off in the second-round runoff on May 7 after a nail-biting vote seen as vital for the future of the EU.

National Front Party leader and presidential candidate Marine Le Pen salutes the crowd after a political meeting on April 27 in Nice, France. Le Pen is campaigning against En Marche founder Emmanuel Macron ahead of the next round of the French presidential elections on May 7.

Russian opposition leader Alexei Navalny poses for a photo after unknown attackers doused him with green antiseptic outside a conference venue in Moscow on April 27. Navalny, who authored a documentary about the Russian prime minister's alleged corrupt wealth that was viewed more than 20 million times online, was the key force behind March's nationwide antigovernment rallies, Russia's largest and most widespread in years.

U.S. Defense Secretary James Mattis looks out over Kabul, Afghanistan, as he arrives via helicopter at Resolute Support headquarters on April 24.

A rescuer retrieves a toy house from the rubble on April 20, the day after mudslides caused by heavy rains reportedly killed 17 people in Manizales, Colombia.

Protesters clash with police during a demonstration in Caracas, one of several held in different cities, against the Venezuelan government of Nicolás Maduro on April 24.

A riot police officer points his gun at indigenous protesters demanding land rights in Brazil on April 25 in Brasília.

Relatives of victims killed in the 2013 Rana Plaza building collapse mourn at the site during the fourth anniversary of the tragedy in Savar, on the outskirts of Dhaka, Bangladesh, on April 24.

Etienne Cardiles pays tribute to his civil partner, Xavier Jugele, the policeman (seen in the portrait) killed on April 20 by a jihadist in an attack on the Champs-Élysées, in an April 25 ceremony at the Paris prefecture building.

Iraqi Shiite Muslim worshipers carry a symbolic coffin of the eighth-century Imam Musa al-Kadhim during funeral processions marking the anniversary of his death at his shrine in Baghdad's northern district of Kadhimiya on April 23.

Farmer Piet Warmerdam picks a yellow tulip from a field of red flowers, as its growth could damage the rest, in Den Helderin, Netherlands, on April 22.

Women mourn in a cemetery in an abandoned village in Khoiniki District in Belarus's Gomel Region, heavily affected by radiation from the 1986 Chernobyl nuclear reactor disaster. Some of its territory remains part of the Chernobyl exclusion zone, and people can enter the area freely only on the Orthodox feast of Radunitsa, a day of remembrance for the departed.

A soldier attends a dawn service at Dee Why beach in Sydney on Anzac Day, April 25, the anniversary of the 1915 landing of thousands of troops from the Australian and New Zealand Army Corps (Anzac) on Turkey's Gallipoli peninsula.