18 January 2013
Last updated at 15:47
Serena Williams fought through the pain after injuring her right ankle in her first-round match at the Australian Open. Williams had medical treatment after slipping before recovering to beat Edina Gallovits-Hall 6-0, 6-0.
Two boxers train under the illumination of the Haslingden Halo Panopticon, England. The installation, designed by John Kennedy of LandLab, sits on a reclaimed landfill site in east Lancashire.
A tourist wearing a mask visits Tiananmen Square as high levels of air pollution are recorded in Beijing, China.
Lucio Alvarez and co-driver Ronnie Graue of team Toyota compete in stage nine during the 2013 Dakar Rally in Tucuman, Argentina.
US President Barack Obama unveiled the most sweeping gun control proposals in two decades, calling for a ban on assault weapons and high-capacity magazines and wider background checks on gun buyers. Mr Obama unveiled the proposals at the White House flanked by children who wrote him letters after December's Newtown shooting, which left 20 children and six teachers dead.
A steam train which carried passengers in the 19th Century returned to the Tube to mark 150 years since the first London Underground journey. Ticketholders travelled in coaches pulled by an 1898-built steam engine, known as Met Locomotive No 1.
Workers fix a lamp-post, one of many that will illuminate the vast grounds receiving the millions of Hindu devotees who will congregate for the next couple of months to celebrate the Kumbh Mela, in Allahabad, India.
Two people were killed and 12 were hurt when a helicopter crashed into a crane on a building in central London. The helicopter hit the crane on top of The Tower, One St George Wharf beside the Thames at about 08:00 GMT.
India's Foreign Minister, Salman Khurshid, said he would "not rush" into talks with his Pakistani counterpart to defuse military tensions in Kashmir. The two armies have agreed to "de-escalate" tensions along the Line of Control after a meeting of their chiefs of operations.
As snow falls on London, troops of the Household Cavalry Mounted Division pass by Buckingham Palace on their way to Horseguards for their ceremonial duty.