Vigils for Alan Johnston

An image of the kidnapped BBC reporter Alan Johnson is projected on to Battersea Powerstation on the eve of his 100th day in captivity Photograph: Chris Jackson/Getty

BBC staff gather in the London TV Centre newsroom Photograph: BBC/Getty

Members of the media gather on College Green Photograph: Bruno Vincent/Getty

Members of the media, including the BBC's Reeta Chakrabarti and John Pienaar (left) and Sky News political editor Adam Boulton (centre), gather on College Green Photograph: Bruno Vincent/Getty

Members of Reporters Sans Frontieres hold placards bearing the name of media organisations, in front of the Eiffel tower Photograph: Martin Bureau/AFP

Natasha Kaplinsky, George Alagiah, Sophie Raworth, Nick Gowing and Emily Maitlis taking part in worldwide vigil Photograph: BBC

BBC employees stick a banner on a poster of their kidnapped colleague Alan Johnston outside Bush House in central London Photograph: Bertrand Langlois/AFP

BBC sports presenter Claire Balding, at Ascot ladies' day, holds a poster as she leads a silence in memory of the kidnapped BBC correspondent Alan Johnston Photograph: Julian Herbert/Getty

Members of the Eastenders cast and crew, on the Albert Square set in Elstree Photograph: BBC

BBC staff in New York Photograph: BBC

Alan's parents, Graham and Margaret Johnston, were joined by villagers at their home in Lochgoilhead, Scotland as they release 100 balloons into the air Photograph: BBC