The day in pictures - 21 February, 2013
Hohne, Germany
The Queen's Royal Hussars (QRH) is the British Army's senior light cavalry regiment and is equipped with the Challenger 2 main battle tank. The Regiment has previously deployed on operations in Kosovo, Iraq and Afghanistan.
Aden, Yemen
Supporters of Yemen's President Abd-Rabbu Mansour Hadi attended a rally to mark the first anniversary of his election in the southern port city of Aden.
Krasnoyarsk, Russia
Zebras, female Zizi (front) and male Moryachok, run on the snow in an open-air enclosure at the Royev Ruchey zoo.
Arizona, USA
Rory McIlroy tweeted that it was "officially ridiculous", Ian Poulter said he had never seen anything like it and caddies enjoyed a snowball fight when wintry weather hit the Arizona desert.
Less than four hours of golf was possible at the Accenture Match Play Championship with Rory McIlroy, Tiger Woods and Luke Donald all failing to tee off after the unusually inclement weather stopped play.
Colombo, Sri Lanka
Children play on a beach in Sri Lanka including a boy who plays with his pet.
Damascus, Syria
At least 53 people have been killed in a large explosion that rocked the Syrian capital Damascus, opposition activists said.
Hong Kong, China
British Indian marathon runner Fauja Singh, 101, looks at the view in Hong Kong. Singh will take part in a 10-kilometre race at the Hong Kong Marathon on Sunday before he officially retires from public races.
London, UK
An image taken from the top of the BT Tower has set a record for the world's largest panoramic photo. It comprises more than 48 000 frames collated into a single panorama and allows the viewer to zoom in to see incredible detail. It captures the capital as it was just after the 2012 Olympics in the summer.