Photo highlights of the day

Roger Federer of Switzerland throws a towel between points as he plays Rafael Nadal of Spain during their semifinal at the Australian Open tennis championship in Melbourne.

Throw in the towel: Roger Federer of Switzerland between points as he plays Rafael Nadal of Spain during their semi-final at the Australian Open tennis championship in Melbourne. Photograph: Rick Rycroft/AP

An Egyptian man carries paperwork away from the building. A crude device exploded near a police station in a Cairo suburb, security sources said, hours after a car bomb killed at least four people near the Egyptian police headquarters in the center of the Egyptian capital.

An Egyptian man carries paperwork away from the building after at least five people were killed in three bomb attacks near the Egyptian police headquarters. Photograph: Ahmed Taranh/Demotix/Corbis

A passenger throws a piece of garbage on the floor as a cleaner collects garbage on a carriage of a train

Move along the carriage: a passenger throws litter on the floor as a cleaner collects rubbish on a train from Shenzhen to Zhengzhou, China, during the spring festival travel rush. Photograph: Reuters

Incendiary projectiles are ready to be used by anti-government protesters near Dynamo Stadium in Kiev, Ukraine.

Prepared molotov cocktails in a crate near Dynamo Stadium in Kiev, Ukraine. Photograph: Brendan Hoffman/Getty Images

Afghan children ride on a ferris wheel near a cemetery in Kabul. Photograph: Johannes Eisele/AFP/Getty Images

Models walk the runway during the FIMI Kids International Fashion Show 2014 at the Real Fabrica de Tapices in Madrid, Spain.

An unorthodox way to parade your new shoes, as a young model walks the runway at the FIMI kids' international fashion show in Madrid, Spain. Photograph: Carlos Alvarez/Getty Images

Andy and Tina Facey from Kent prepare their Siberian Huskies and Malamutes for racing. Press and practice day ahead of the 31st Aviemore Sled Dog Rally.

Tina Facey prepares her Siberian huskies and malamutes for racing before the 31st Aviemore Sled Dog Rally. See more in the gallery. Photograph: Murdo MacLeod for the Guardian

A Thai anti-government protester waves a national flag during ongoing rallies at a protest site at Victory Monument in downtown Bangkok.

A Thai anti-government protester waves a national flag creating this graphic composition at Victory Monument in downtown Bangkok. Photograph: Christophe Archambault/AFP/Getty Images

Janine Flock of Austria speeds down the track during her first run of the women's Skeleton World Cup race in Koenigssee, Germany.

Head for speed: a clean reflective action shot as Janine Flock of Austria speeds down the track during the women's Skeleton World Cup race in Königssee, Germany. Photograph: Matthias Schrader/AP

A Filipino boy takes an afternoon rest under a busy bridge used as a shelter in Paranaque, Manila, Philippines. Between the water below and traffic passing overhead, many Filipino families driven by poverty have set up makeshift residences under bridges.

A boy takes a rest under a busy bridge used as a shelter in Parañaque, Philippines. Between the water below and traffic passing overhead, many Filipino families driven by poverty have set up makeshift residences under bridges. Photograph: Ezra Acayan/Barcroft Media

Identical twins Edgar and Gabriel pose for photographs with two version of Dutch artist Vincent van Gogh's Sunflowers paintings at the National Gallery in London.

From the same seed? Identical twins Edgar and Gabriel with two versions of Dutch artist Vincent van Gogh's Sunflowers paintings at the National Gallery in London. Brought together for the first time in 65 years, the National Gallery's own Sunflowers (1888) is joined by the Van Gogh Museum's Sunflowers (1889). Photograph: Leon Neal/AFP/Getty Images

Artist Grayson Perry holds his CBE presented by the Prince of Wales during an investiture ceremony at Buckingham Palace, London. Photograph: John Stillwell/PA Wire/Press Association Images

India's Border Security Force (BSF) soldiers ride their camels in front of India's presidential palace

Border Security Force soldiers ride their camels in front of the presidential palace, Rashtrapati Bhavan during a rehearsal for India's Republic Day celebrations in New Delhi. See more of the parade in the gallery. Photograph: Ahmad Masood/Reuters

Anti-government protesters guard a burnt barricade on a street near Dynamo stadium in Kiev, Ukraine.

Anti-government protesters smoke beside a burnt barricade on a street near Dynamo stadium in Kiev, Ukraine. Photograph: Brendan Hoffman/Getty Images

Irving Finkel with the 4000 year old clay tablet containing the story of the Ark and the flood during the launch of his book 'The Ark Before Noah' at the British Museum in London. Photograph: Sang Tan/AP

A firefighter checks for gas leaks as rescue personnel search through icy rubble to try to locate more victims of a fire that destroyed a seniors' residence in L'Isle-Verte, Quebec. Five people are confirmed dead and 30 people are still missing. Photograph: Ryan Remiorz/AP

Nic Lamb rides a wave during the third heat of the first round of the Mavericks Invitational big wave surf contest in Half Moon Bay, California. Photograph: Eric Risberg/AP