The Observer's 20 photographs of the week

A tray of glass eyes are seen at the shop of ocularist Gerhard Greiner in Munich, who produces individual hand glass-blown human eye prostheses Photograph: Michaela Rehle/Reuters

Late nurse Jacintha Saldanha's daughter Lisha is consoled outside Westminster Cathedral after a mass for her mother Photograph: Leon Neal/AFP

The newly elected government and opposition politicians fight in the Ukrainian parliament. The session collapsed amid the chaos Photograph: Alexey Furman/Corbis

A Palestinian participates in a rally to celebrate the 25th anniversary of Hamas in the West Bank city of Nablus. Supporters rallied in the first West Bank march by the Islamic militant group since it took Gaza from the Western-backed Fatah party of Palestinian president Mahmoud Abbas in 2007 Photograph: Majdi Mohammed/AP

Palestinians gather for a rally marking the 25th anniversary of Hamas at which the movement's leader in exile Khaled Meshaal spoke on his first ever visit to Gaza Photograph: Marco Longari/AFP

Visitors walk across the Capilano suspension bridge decorated in Christmas lights in North Vancouver, British Columbia. Built in 1889, the bridge stretches 135 metres across and 70 metres above the Capilano river Photograph: Andy Clark/Reuters

A gallery employee poses next to the artwork Tom Na H-iu by Japanese video and performance artist Mariko Mori at the Royal Academy of Arts in London Photograph: Stefan Wermuth/Reuters

The situation in Syria further deteriorated this week. The number of refugees has continued to rise and is estimated to be well over 400,000. Here refugees cross from Syria to Turkey via the Orontes river Photograph: Manu Brabo/AP

Two Syrian refugee children, whose family fled their home in Idlib, walk to their tent at a camp for displaced Syrians in Atmeh Photograph: Muhammed Muheisen/AP

Red shoes in front of the State Attorney Office in Ciudad Juarez, Mexico, laid out by relatives to symbolise missing women and protest at the lack of progress in investigating the crimes Photograph: Jesus Alcazar/AFP

North Korean soldiers attend a mass rally in Kim Il-sung Square in Pyongyang, organised to celebrate the success of a rocket launch that sent a satellite into space Photograph: Ng Han Guan/AP

Egyptian army tanks are deployed outside the presidential palace in Cairo. Egypt's crisis showed no sign of easing as the army delayed talks meant to ease political divisions and the opposition set near-impossible demands for taking part in a constitutional referendum Photograph: Gianluigi Guercia/AFP

At the referendum, an Egyptian soldier helps an elderly man after he cast his vote Photograph: Petr David Josek/AP

A group of boys play football at the edge of the surf at Copacabana Beach in Rio de Janeiro Photograph: Gary Hershorn/Reuters

Chairman of the Federal Reserve Ben Bernanke speaks at a press briefing at the Federal Reserve in Washington, DC Photograph: Brendan Smialowski/AFP

Elephants head to the river for an early morning bathe at an elephant camp in Golden Triangle, Thailand Photograph: Paula Bronstein/Getty

Chinese military personnel attend a ceremony for victims on the 75th anniversary of the Nanjing massacre at the Memorial Museum. Air raid sirens marked the anniversary of the mass killing and rape by Japanese soldiers Photograph: Peter Parks/AFP

Ultra-Orthodox Jewish children dance in Mea Shearim, Jerusalem, during the Hanukkah holiday celebrated by Jews worldwide to commemorate the rededication of the Holy Temple in Jerusalem in the 2nd century BC Photograph: Abir Sultan/EPA

Ultra-Orthodox Jewish men celebrate in Bnei Brak, Israel, during the holiday of Hanukkah Photograph: Dan Balilty/AP

Young children wait outside Sandy Hook elementary school in Newtown, Connecticut, after the shooting massacre Photograph: Michelle McLoughlin/Reuters