Week in pictures: 29 January - 3 February 2017 - BBC News

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DAN MULLAN/GETTY IMAGES
A competitor plunges into the mud during the Tough Guy Challenge, an extreme obstacle course, at South Perton Farm in Telford, England.





KEVIN FRAYER/GETTY IMAGES
Sparks fly as Chinese dragon dancers perform at a local park on the fifth day of the Chinese Lunar New Year in Beijing, China. The new year, also known as the Spring Festival, is based on the lunar Chinese calendar. Each year is marked by one of 12 animals that appear on the Chinese zodiac. This year is the year of the Rooster.





QUINN ROONEY/GETTY IMAGES
Roger Federer won his 18th Grand Slam title, and first for five years, with a thrilling five-set victory over Rafael Nadal in the Australian Open final.





SCOTT OLSON/GETTY IMAGES
Protests took place in some airports across the US after President Donald Trump signed an executive order banning migrants and refugees entering the United States from several mainly Muslim countries. President Trump heralded "a very good day" for US security after his new travel ban was implemented.





DARKO VOJINOVIC / AP
Montenegro's Prime Minister Dusko Markovic (centre left) was escorted by his Serbian counterpart Aleksandar Vucic during a welcoming ceremony at the Serbia Palace in Belgrade. Markovic was on a two-day official visit to the country.





JANE BARLOW/PA
The spectacular annual Up Helly Aa Viking fire festival has been held in Shetland. Hundred of torchbearers paraded through the streets of Lerwick, before burning a replica Viking galley. It is the biggest procession of its kind in Europe and celebrates the islands' Viking heritage.





GLEB GARANICH/REUTERS
In eastern Ukraine both government troops and pro-Russian rebels reported new casualties. Avdiivka, whose population is estimated to be about 22,000, has been left without water and electricity in freezing conditions because of the shelling. Ukrainian officials and aid agencies have warned of a major humanitarian crisis, declaring a state of emergency in the town.





FRANCISCO LEONG / AFP
A couple watch as big waves break near the Sao Miguel Arcanjo fort in Nazare, central Portugal.





LUONG THAI LINH / EPA
Artists from all over Vietnam took part in the Tich Dien festival in Ha Nam province.