Best photos of the day: a German tiger and a Tehran funeral

A selection of photo highlights from around the world, including the funeral of the former Iranian president Akbar Hashemi Rafsanjani, and a four month-old tiger

Fort Lauderdale, Antartica and Istanbul – the 20 photographs of the week

The aftermath from the nightclub attack in Istanbul, a massive rift at an ice shelf in Antarctica, the fragile ceasefire in Syria – the news of the week captured by the world’s best photojournalists

Guardian photographer of the year 2015: Yannis Behrakis

This year the Guardian picture desk has chosen Yannis Behrakis of Reuters as their agency photographer of the year. Here are the most astonishing moments he captured in two of the biggest stories of 2015 – the refugee crisis and the financial implosion in his home country Greece