Facebook CEO Mark Zuckerberg is surrounded by members of the media as he arrives to testify before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis TPX IMAGES OF THE DAY
DAMASCUS, SYRIA - APRIL 07: An affected Syrian child receives medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Halil el-Abdullah/Anadolu Agency/Getty Images)
A young Mexican helps a compatriot to climb the metal wall that divides the border between Mexico and the United States to cross illegally to Sunland Park, from Ciudad Juarez, Chihuahua state, Mexico on April 6, 2018.
US President Donald Trump on April 5, 2018 said he would send thousands of National Guard troops to the southern border, amid a widening spat with his Mexican counterpart Enrique Pena Nieto. The anti-immigration president said the National Guard deployment would range from 2,000 to 4,000 troops, and he would 'probably' keep many personnel on the border until his wall is built -- spelling out a lengthy mission.
/ AFP PHOTO / HERIKA MARTINEZ (Photo credit should read HERIKA MARTINEZ/AFP/Getty Images)
Rachele-Ngabausi, 2, injured by militiamen when they attacked the village of Tchee, stands in an Internally Displaced Camp in Bunia, Ituri province, eastern Democratic Republic of Congo, April 9, 2018. According to witnesses, militiamen killed her pregnant mother, her three brothers and chopped off her sister's arm. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY
House Speaker Paul Ryan (R-WI) addresses a news conference where he announced he would not seek re-election in November, on Capitol Hill in Washington, U.S., April 11, 2018. REUTERS/Aaron P. Bernstein TPX IMAGES OF THE DAY
TOPSHOT - Picture released by Telam showing rescue workers and locals helping a stranded whale in Mar del Plata, Argentina, on April 9, 2018.
The whale died despite rescue efforts. / AFP PHOTO / TELAM / DIEGO IZQUIERDO / Argentina OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / TELAM / DIEGO IZQUIERDO' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read DIEGO IZQUIERDO/AFP/Getty Images)
MOSCOW, RUSSIA - APRIL,8 (RUSSIA OUT) Russian Orthodox belivers attend the Orthodox Easter service in the Christ the Saviour Cathedral in Central Moscow, Russia,early April,8, 2018. Russian Orthodox Church are celebrating the Easter on April, 8 this year, later than catholics and many other christians. (Photo by Mikhail Svetlov/Getty Images)
Rescue workers search for missing people at the site where houses were buried in a landslide at Yabakei town in Nakatsu, Oita Prefecture, southwestern Japan, in this aerial view photo taken by Kyodo April 11, 2018. Mandatory credit Kyodo/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN.
A devotee, dressed as Hindu God Shiva, looks out from a window as he waits to perform during the annual Shiva Gajan religious festival on the outskirts of Agartala, India April 13, 2018. REUTERS/Jayanta Dey TPX IMAGES OF THE DAY
WASHINGTON, DC - APRIL 09: David Barrows is dressed to resemble John Bolton, who started his first day today as President Trump's national security advisor, during a rally to protest in front of the White House, on April 9, 2018 in Washington, DC. (Photo by Mark Wilson/Getty Images)
A migrant boy from Central America, moving in a caravan through Mexico, sucks a lollipop during a demonstration outside the U.S. Embassy in Mexico City, Mexico April 12, 2018. REUTERS/Edgard Garrido TPX IMAGES OF THE DAY
Sakakibara Kikai's engineer Go Sakakibara poses with the bipedal robot Mononofu during its demonstration at its factory in Shinto Village, Gunma Prefecture, Japan, April 12, 2018. Picture taken on April 12, 2018. REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY
Model Janice Dickinson waits outside the courtroom in the Montgomery County Courthouse before testifying against actor and comedian Bill Cosby during the fourth day of his sexual assault retrial case in Norristown, Pennsylvania, U.S., April 12, 2018. Mark Makela/Pool via Reuters TPX IMAGES OF THE DAY
DAMASCUS, SYRIA - APRIL 07: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'SYRIAN CIVIL DEFENSE (WHITE HELMETS) / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Affected Syrian kids receive medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Douma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. At least 78 civilians dead, including women and children, according to the initial findings. (Photo by WHITE HELMETS / HANDOUT/Anadolu Agency/Getty Images)
New Canadian citizen David Alfonso, 8, reacts as maple taffy is prepared for new Canadians following a citizenship ceremony at the Vanier Sugar Shack in Ottawa, Ontario, Canada, April 11, 2018. REUTERS/Chris Wattie TPX IMAGES OF THE DAY
A newborn Asian elephant is pictured on the first day of a public appearance at the Planckendael Zoo in Mechelen, Belgium April 11, 2018. REUTERS/Yves Herman TPX IMAGES OF THE DAY
U.S. President Donald Trump looks as a woman becomes emotional, before signing H.R. 1865 "The Allow States and Victims To Fight Online Sex Trafficking Act" at the White House in Washington, U.S., April 11, 2018. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
MUENSTER, GERMANY - APRIL 08: People arrive to lay flowers and candles at the site of an attack with a van the day before that left three people dead and dozens injured on April 8, 2018 in Muenster, Germany. The driver, reportedly a German with psychiatric problems, drove the van with high speed into a crowd of people sitting outside a pub, killing two before he committed suicide with a gun. (Photo by Alexander Koerner/Getty Images)
Rescuers are seen around the wreckage of an Algerian army plane which crashed near the Boufarik airbase from where the plane had taken off on April 11, 2018.
The Algerian military plane crashed and caught fire killing 257 people, mostly army personnel and members of their families, officials said. / AFP PHOTO / Ryad KRAMDI (Photo credit should read RYAD KRAMDI/AFP/Getty Images)
U.S. first lady Melania Trump speaks during a listening session with students at the White House in Washington, U.S., April 9, 2018. REUTERS/Joshua Roberts
NEW YORK, NY - APRIL 13: Michael Cohen, U.S. President Donald Trump's personal attorney, crosses E. 61st St. near the Loews Regency hotel on Park Ave on April 13, 2018 in New York City. Following FBI raids on his home, office and hotel room, the Department of Justice announced that they are placing him under criminal investigation. (Photo by Yana Paskova/Getty Images)
A local resident walks along a section of Matahari Terbit beach covered in plastic and other debris washed ashore by seasonal winds near Sanur, Bali, Indonesia April 11, 2018. REUTERS/Johannes P. Christo TPX IMAGES OF THE DAY
Japanese Masazo Nonaka, who was born 112 years and 259 days ago, eats his favorite cake as he receives a Guinness World Records certificate naming him the world's oldest man during a ceremony in Ashoro, on Japan's northern island of Hokkaido, in this photo taken by Kyodo April 10, 2018. Mandatory credit Kyodo/via REUTERS ATTENTION EDITORS -THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN. THIS IMAGE WAS PROCESSED BY REUTERS TO ENHANCE QUALITY, AN UNPROCESSED VERSION HAS BEEN PROVIDED SEPARATELY. TPX IMAGES OF THE DAY
NORRISTOWN, PA - APRIL 09: Actor/ stand-up comedian Bill Cosby is seen walking away as topless protester Nicolle Rochelle being escorted after her arrest during the first day of Cosby's retrial for sexual assault charges on April 9, 2018 in Norristown, Pennsylvania. A former Temple University employee alleges that the entertainer drugged and molested her in 2004 at his home in suburban Philadelphia. More than 40 women have accused the 80 year old entertainer of sexual assault. (Photo by Gilbert Carrasquillo/Getty Images)
The gorilla "Fatou" eats a birthday cake at the Berlin Zoo, Germany, April 13, 2018. REUTERS/Axel Schmidt TPX IMAGES OF THE DAY
VERESEGYHAZ, HUNGARY - APRIL 08: People, dressed in traditional clothes, cast their votes during Hungarian parliamentary election at a polling station in Veresegyhaz, Hungary on April 08, 2018. (Photo by Arpad Kurucz/Anadolu Agency/Getty Images)
UNITED STATES - APRIL 10: Cutouts of Facebook CEO Mark Zuckerberg appear on the east lawn of the Capitol ahead of his testimony before a joint hearing of the Senate Judiciary and Commerce Committees on the protection of user data on April 10, 2018. Avaaz set up the display to call on Facebook to delete fake accounts. (Photo By Tom Williams/CQ Roll Call)
A stuntman performs a test ride on a motorcycle inside the "Well of Death" arena during a fair in Bhaktapur, Nepal April 9, 2018. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY
Ivanka Trump attends a meeting at Lima Stock Exchange in Lima, Peru April 12, 2018. REUTERS/Marcos Brindicci TPX IMAGES OF THE DAY
A young gold miner works in Makala gold mine camp near the town of Mongbwalu in Ituri province, eastern Democratic Republic of Congo, April 7, 2018. Picture taken April 7, 2018. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY
Pope Francis greets a man holding a llama as he arrives to lead the Wednesday general audience in Saint Peter's square at the Vatican, April 11, 2018. REUTERS/Remo Casilli
NEW YORK, USA - APRIL 7 : Smoke rises from the 50th floor of Trump Tower in New York, United States on April 7, 2018. (Photo by Muhammed Said Tanl/Anadolu Agency/Getty Images)
Devotees pull the chariot of God Bhairab during the Biska Festival also known as Bisket Festival in Bhaktapur, Nepal April 10, 2018. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY
LONDON, ENGLAND - APRIL 12: A clock face on Elizabeth Tower, commonly known as Big Ben, is seen without its hour and minute hands as conservation work continues on the Houses of Parliament on April 12, 2018 in London, England. An estimated total of ï¿½61 million is being spent on the conservation of Elizabeth Tower, works are expected to be completed by 2021. (Photo by Chris J Ratcliffe/Getty Images)
Mourners comfort each other as people attend a vigil at the Elgar Petersen Arena, home of the Humboldt Broncos, to honour the victims of a fatal bus accident in Humboldt, Saskatchewan, Canada April 8, 2018. Jonathan Hayward/Pool via REUTERS TPX IMAGES OF THE DAY
Protesters stand and chant with placards as US Secretary of State nominee Mike Pompeo (C) arrives to testify before the Senate Foreign Relations Committee during his confirmation hearing on Capitol Hill in Washington, DC, on April 12, 2018. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
FRANKFORT, KY - APRIL 13: Kentucky Public school teachers protest outside the Kentucky House Chamber as they rally for a 'day of action' at the Kentucky State Capitol to try to pressure legislators to override Kentucky Governor Matt Bevin's recent veto of the state's tax and budget bills April 13, 2018 in Frankfort, Kentucky. The teachers also oppose a controversial pension reform bill which Gov. Bevin signed into law. (Photo by Bill Pugliano/Getty Images)
KYANGWALI, UGANDA - APRIL 10: Refugees from the Democratic Republic of Congo stand under a shelter with their food collected from the World Food Programme as it rains in the Kyangwali settlement on April 10, 2018 in Kyangwali, Uganda. According to the UNHCR around 70,000 people have arrived in Uganda from the Democratic Republic of Congo since the beginning of 2018 as they escape violence in the Ituri province. The majority of refugees are arriving by boat across Lake Albert, which lies between the two countries. With refugee settlements in Uganda almost at maximum capacity there are plans for new settlements to be built to deal with the continuing influx of people. A cholera outbreak in the settlements has left at least 42 dead and many hundreds severely affected. The World Food Programme anticipates providing food and nutrition for up to 1.6 million refugees this year. Fighting in DRC between the Hema and Lendu communities has seen villages being burnt and dozens killed in the fresh outbreak of violence. (Photo by Jack Taylor/Getty Images)
AUSCHWITZ-BIRKENAU, OSWIECIM, POLAND - 2018/04/12: Participants of International March of the Living organized in Auschwitz-Birkenau Nazi concentration camp in remembrance of people who died due to holocaust. (Photo by JP Black/LightRocket via Getty Images)
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The week began with details emerging about a suspected chemical weapons attack in Syria over the weekend. At least 60 people were killed and more than 1,000 injured during the attack in the town of Douma. On Friday, President Donald Trump announced that he had ordered strikes targeting Syrian President Bashar al-Assad's chemical weapons capabilities.
Other major headlines of the week included House Speaker Paul Ryan announcing he will not seek re-election in November, a military plane crash in Algeria that left more than 250 people dead and Facebook CEO Mark Zuckerberg testifying at a joint Senate hearing.
Click through the slideshow above to see photos from all of these events and more, and be sure to check back next weekend for our selection of the best photography from the week.