Tucson — President Obama leads a memorial service for the six people killed and 13 wounded in the attack at an event hosted by Rep. Gabrielle Giffords, who remains hospitalized in grave condition.

PHOTOGRAPH BY: JEWEL SAMAD / AFP/Getty Images

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Washington — A blanket of snow covers the North Lawn of the White House. A broad stretch of the northeastern United States, including New York and Boston, was hit by another snowstorm.

PHOTOGRAPH BY: JIM WATSON / AFP/Getty Images

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Boston — A lone cyclist braves the snow blanketing the city.

PHOTOGRAPH BY: BRIAN SNYDER / REUTERS

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Teresopolis, Brazil — Rescue workers search for victims after heavy rains caused mudslides. More than a thousand people have been left without homes and 71 died in Teresopolis, in Rio de Janeiro state.

PHOTOGRAPH BY: VANDERLEI ALMEIDA / AFP/Getty Images

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Port-au-Prince, Haiti — A man on crutches makes his way through the ruins of the Notre Dame Cathedral in the Haitian capital on the first anniversary of the devastating earthquake.

PHOTOGRAPH BY: HECTOR RETAMAL / AFP/Getty Images

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Juba, Sudan — A voter's hand is reflected in his sunglasses as he casts his ballot in Juba. South Sudan's ruling party said that the 60% turnout required for the landmark independence referendum to be declared valid had been reached after just three days of polling.

PHOTOGRAPH BY: YASUYOSHI CHIBA / AFP/Getty Images

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Khartoum, Sudan — A South Sudanese child plays in a cardboard box at the Mandela camp on the outskirts of the Sudanese capital.

PHOTOGRAPH BY: MOHAMED NURELDIN ABDALLAH / REUTERS

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New Delhi — An boy looks up as he sorts onions at a market in the Indian capital. Onion traders in the city announced an indefinite strike to protest raids on their premises in the wake of a crisis over soaring onion prices.

PHOTOGRAPH BY: PRAKASH SINGH / AFP/Getty Images

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Turin, Italy — A Fiat auto worker waves a FIOM union flag during a demonstration in Turin. Workers at the Italian automaker's Mirafiori plant vote this week on an agreement for additional shifts and reduced benefits in exchange for a commitment from the company for further investments to build new models in the country.

PHOTOGRAPH BY: STRINGER/ITALY / REUTERS

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Berlin — German Chancellor Angela Merkel speaks with Italian Prime Minister Silvio Berlusconi after reviewing a guard of honor upon his arrival at the Chancellery in Berlin.

PHOTOGRAPH BY: FABRIZIO BENSCH / REUTERS

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Yiwu, China — Replicas of the British royal engagement ring are packaged at a jewelry factory in Zhejiang province. Chinese manufacturers are cashing in on the British royal wedding craze, producing tens of thousands of replica rings for the global market.

PHOTOGRAPH BY: CARLOS BARRIA / REUTERS

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Beijing — Russian performers in rabbit costumes wait backstage during rehearsals for a Chinese New Year show at Beijing Television Studios. China will celebrate the Year of the Rabbit on Feb. 4.

PHOTOGRAPH BY: PETER PARKS / AFP/Getty Images

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New York — A jogger crosses the Brooklyn Bridge after a snowstorm.

PHOTOGRAPH BY: Mark Lennihan / Associated Press

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Windsor, Conn. — Roy Williams of Westfield, Mass., shovels snow in front of his vehicle on a merge ramp on Interstate 91 southbound during a winter storm in Windsor. Williams said a plow clearing the highway passed by and blocked him in.

PHOTOGRAPH BY: Jessica Hill / Associated Press

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Albany, N.Y. — A shovel-toting person walks along a street during a winter storm in Albany.

PHOTOGRAPH BY: Mike Groll / Associated Press

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Brisbane, Australia — A reflection of local residents talking is seen on a flooded street in Brisbane, Australia.

PHOTOGRAPH BY: TIM WIMBORNE / Reuters

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Brisbane, Australia — Residents use a boat to navigate across their flooded suburb as flood waters cover Brisbane. Australia's third-biggest city is besieged by floods that are expected to affect at least 40,000 homes.

PHOTOGRAPH BY: TORSTEN BLACKWOOD / AFP / Getty Images

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Brisbane, Australia — A local resident walks with his surfboard past flooded shops in Brisbane.

PHOTOGRAPH BY: TIM WIMBORNE / Reuters

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South East Queensland, Australia — A vehicle is swept away in floodwaters in Queensland. Deadly floodwaters flowed onto the streets in Australia's northeastern state of Queensland since drenching rains that began in November sent swollen rivers spilling over their banks, inundating an area larger than France and Germany combined.

PHOTOGRAPH BY: Associated Press

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Port-au-Prince, Haiti — People pray during a memorial service near the presidential palace in Port-au-Prince on the one-year anniversary of the massive earthquake that devastated Haiti.

PHOTOGRAPH BY: Joe Raedle / Getty Images

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Port-au-Prince, Haiti — A woman holding rosary beads prays in front of the Haiti cathedral, which was destroyed in the 2010 earthquake, in Port-au-Prince.

PHOTOGRAPH BY: JORGE SILVA / Reuters

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Port-au-Prince, Haiti — People attend a memorial service near the presidential palace in Port-au-Prince, Haiti.

PHOTOGRAPH BY: Joe Raedle / Getty Images

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Doha, Qatar — An Uzbek fan cheers for his team before the start of the 2011 Asian Cup Group A soccer match between Uzbekistan and Kuwait at Al-Gharafa Stadium in the Qatari capital Doha.

PHOTOGRAPH BY: PORNCHAI KITTIWONGSAKUL / AFP / Getty Images

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Alpe d'Huez, France — A pack of skiers competes during the FIS Freestyle World Cup women's ski cross in Alpe d'Huez, France.

PHOTOGRAPH BY: Vianney Thibaut/Agence Zoom / Getty Images

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Gaza Strip — Palestinian relatives of the Islamic Jihad militant Muhammed Al-Nagar, who was killed Jan. 11 during an Israeli airstrike, mourn at his funeral.

PHOTOGRAPH BY: ALI ALI / EPA

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