Photos of the week
The most compelling photos from the week's news, Jan. 6-22, 2016, including the lead up to the Iowa Caucuses and the return of Americans imprisoned in Iran.
In this photo, the face of dummy used to simulate a suicide bomber is marked with a flag among the debris of a blast during a course on blast scene investigation near Hua Hin, Thailand, January 18, 2016.
By CBSNews.com Senior Photo Editor Radhika Chalasani
Bernie Sanders t-shirt
A volunteer at a U.S. Democratic presidential candidate Bernie Sanders' campaign event wears a shirt decorated with Sanders' image in Fort Dodge, Iowa, January 19, 2016. The Iowa Caucuses will be held February 1.
Germany - Angela Merkel
German Chancellor Angela Merkel looks at a combat diver during her visit to Naval Base Command in Kiel, Germany, January 19, 2016. R
Martin Luther King Day
A man is reflected in glass while walking past a photo of the Rev. Martin Luther King Jr. hanging at Ebenezer Baptist Church where King preached, during the Martin Luther King holiday commemorative service in Atlanta, January 18, 2016.
Iowa
An climber ascends a silo covered in ice in Cedar Falls, Iowa, January 17, 2016.
The owners have connected hoses to the top of the silo and spray it with water in winter months to freeze the exterior for climbing.
Palin endorses Trump
Former Alaska Gov. Sarah Palin (L) points to U.S. Republican presidential candidate Donald Trump (R) as she speaks after endorsing him for President at a rally at Iowa State University in Ames, Iowa, January 19, 2016.
Marina Litvinenko
Marina Litvinenko, widow of former Russian spy Alexander Litvinenko, places her arm around her son Anatoly during a press conference in London, January 21, 2016.
Judge Robert Owen said Thursday he is certain that Alexander Litvinenko was given tea laced with a fatal dose of polonium-210 at a London hotel in November 2006. He says there is a "strong probability" that the FSB directed the killing and the operation was "probably approved" by Russian President Vladimir Putin.
Budapest - Taxi protest
Taxis block a main road in Budapest's city center, Hungary, January 18, 2016.
Taxi drivers were protesting against the online taxi-hailing service Uber, demanding authorities to ban the service, according to local media.
Migrants take shelter
A Syrian woman with her children takes shelter in a iron box during a rainfall, after they arrived from Turkey to the Greek deserted island of Pasas near Chios on January 20, 2016.
Thousand of migrants and refugees continue to reach Greece's shores despite the winter weather.
Israel - Rabbi's funeral
Ultra-Orthodox Jewish men hold the body of Rabbi Raphael Shmuelevich, head of the Mir Yeshiva (Jewish seminary), who died on Monday at the age of 78, during his funeral in Jerusalem's Mea Shearim neighborhood January 19, 2016.
Chile - Confiscated weapons
Confiscated weapons hang from a magnet before being destroyed at a foundry in Santiago, Chile, January 18, 2016.
Nearly 13,000 firearms were destroyed as part of a government arms control program.
Hillary Clinton & Demi Lovato
Democratic presidential candidate Hillary Clinton, right, and musician Demi Lovato acknowledge the cheering crowd at a rally on the campus of University of Iowa, Jan. 21, 2016 in Iowa City.
Critics' Choice Awards - Christian Bale
Director Adam McKay kisses Christian Bale as they go on stage to accept the award for Best Comedy for "The Big Short" during the 21st Annual Critics' Choice Awards in Santa Monica, California on January 17, 2016.
British astronaut Tim Peake
British astronaut Tim Peake is shown during his first spacewalk at the International Space Station in this NASA image tweeted on January 15, 2015.
Peake became the first astronaut representing Britain to walk in space when he left the International Space Station (ISS) on Friday to fix a power station problem, generating huge interest back in his homeland.
Spain - Las Luminarias Festival
A man rides a horse through a bonfire during Las Luminarias Festival on January 16, 2015 in San Bartolome de Pinares, Spain.
In honor of Saint Antony the Abbot, the patron saint of animals, horses are ridden through the bonfires on the night before the official day of honoring animals in Spain. The tradition which is hundreds of years old is meant to purify and protect the animal along the year.
Burkino Faso - Terror aftermath
Pizzas are seen on the terrace of Cappuccino restaurant after an attack on the restaurant and the Splendid Hotel in Ouagadougou, Burkina Faso, January 18, 2016.
The attack and siege ended with 29 people dead. An al Qaeda-linked terrorist group claimed responsibility.
Syrian airstrikes
The body of a Syrian man lies on a stretcher at a make-shift hospital following airstrikes on the rebel-held town of Douma, on the eastern edges of the Syrian capital Damascus on January 16, 2016.
Swiss Alps
The Silberhorn mountain casts its shadow during a foggy day on January 16, 2016 above the resort of Wengen, Swiss Alps.
Taiwan's first female president
Taiwan's Democratic Progressive Party (DPP) Chairperson and presidential candidate Tsai Ing-wen addresses reporters after casting her ballot at a polling station during general elections in New Taipei City on January 16, 2016.
Winning 56% of the vote, Tsai Ing-wen became the country's first female President.
Ouagadougou - Terror attack
Security officers take their positions outside the Splendid Hotel in Ouagadougou, Burkina Faso in this still image taken from a video January 15, 2016, during a siege by Islamist gunmen.
The attack and siege ended with 29 people dead. An al Qaeda-linked terrorist group claimed responsibility.
Melbourne - Lleyton Hewitt retires
Australia's Lleyton Hewitt drinks champagne during a news conference while his children, Ava (2nd L-R), Mia and Cruz, watch after playing his last Australian Open singles match before his retirement, at the Australian Open tennis tournament at Melbourne Park, Australia, January 21, 2016.
Nairobi - Memorial
A man lights a candle near a replica of a gun and helmets placed on the ground to symbolize the Kenyan soldiers serving in the African Union Mission in Somalia (AMISOM), who were killed during an attack last week, at a memorial vigil within the "Freedom Corner" in Kenya's capital Nairobi, January 21, 2016.
Al Shabaab, which is aligned with al Qaeda, said its fighters killed more than 100 Kenyan soldiers when they overrun the base in Ceel Cadde, near the Kenyan border on Jan 15.
Germany - Winter
A young girl sits on a bench and enjoys the sunny winter weather with temperatures by the freezing point at a snowy landscape near the small Bavarian village Irschenberg, southern Germany on January 20, 2016.
Gaza City - Parkour
Palestinian boys demonstrate their parkour skills in Gaza City, January 22, 2016.
Minsk - Epiphany
A man dips into the icy waters of a lake as part of celebrations for Orthodox Epiphany on the outskirts of Minsk, January 18, 2016.
Orthodox believers marked Epiphany on January 19 by immersing themselves in icy waters regardless of the weather.
Pakistan - University attack
Pakistani relatives and residents offer funeral prayers for victims of the Bacha Khan university attack in Charsadda, about 50 kilometres from Peshawar on January 21, 2016.
Pakistan observed a day of national mourning for the 21 people killed when heavily-armed gunmen stormed a university in the troubled northwest, exposing the failings in a national crackdown on extremism.
Pakistan - Recycling
Children look for recyclable plastic in a canal in Peshawar, Pakistan, January 17, 2016.
Greece - Migrant rescue
Ahmad Zarour, 32, from Syria, reacts after his rescue by MOAS (Migrant Offshore Aid Station) while attempting to reach the Greek island of Agathonisi, Dodecanese, southeastern Agean Sea, overnight on January 16, 2016.
Maltese-based NGO MOAS (Migrant Offshore Aid Station) rescued 48 migrants and refugees near Agathonisi island.
Germany - Jason Rezaian
Washington Post reporter and Tehran Bureau Chief Jason Rezaian (L) is seen with his wife Yeganeh Salehi (2nd R), mother Mary Rezaian and brother Ali Rezaian (R) in Landstuhl, Germany, January 18, 2016.
Rezaian was one of four American prisoners released by Iran ahead of the lifting of international sanctions on Iran January 16, 2016 -- part of a deal between major powers and Iran to curb Tehran's nuclear program.
Rezaian was brough back back to the U.S. on January 22 by Amazon founder and Washington Post owner Jeff Bezos on a private plane.
Sao Paulo - Mosquitoes
A researcher holds a container with female Aedes aegypti mosquitoes at the Biomedical Sciences Institute in the Sao Paulo's University in Sao Paulo, Brazil, January 18, 2016.
The Aedes aegypti is a vector for transmitting the Zika virus. The Brazilian government announced it will direct funds to a biomedical research center to help develop a vaccine against the Zika virus linked to brain damage in babies.
Turkey - Destroyed home
A women and her children stand in the ruins of battle-damaged house in the Kurdish town of Silopi, in southeastern Turkey, near the border with Iraq on January 19, 2016.
Turkey is waging an all-out offensive against the separatist Kurdistan Workers' Party (PKK), with military operations backed by curfews aimed at flushing out rebels from several southeastern urban centers.
Oklahoma police officer sentenced
Former Oklahoma City police officer Daniel Holtzclaw (R), stands with his defense attorney Scott Adams, as his sentence is read during a hearing in Oklahoma City, January 21, 2016.
Holtzclaw who was convicted of raping four women and sexually assaulting several others while he was on duty, was sentenced to 263 years in prison, the maximum allowable.