Hundreds of Yemeni air force officers and soldiers chant slogans during a protest in the capital Sanaa demanding the ouster of top bosses over accusations of corruption. (AFP)

A masked Egyptian protester is seen during clashes with riot police near the interior ministry in the capital Cairo. (AFP)

Giant figures of Britain's Prince William and his wife, Catherine, Duchess of Cambridge (L) are seen during preparations for the carnival parade in Nice, France. (Reuters)

Gunners from 105 Regiment Royal Artillery fire a twenty-one gun salute in honor of Britain's Queen Elizabeth at Mills Mount Battery at Edinburgh Castle in Scotland. (Reuters)

Riders cycle during the second stage of the Challenge Mallorca cycling tour near the village of Sa Rapita on the Spanish Balearic island of Mallorca. (Reuters)

A monument is covered with snow in Kiev after heavy snowfalls in Ukraine. (AFP)

A dog has ice on its face in Berlin, Germany as a deadly cold snap that has gripped Europe for more than a week wrought more havoc across the continent. (AFP)

A crow flies in the sky with a trace from a jet in the background at the sunset above St.Petersburg, Russia. (AP)