The BBC is holding a day of action tomorrow to step up calls for the release of its journalist Alan Johnston, who was abducted in the Middle East a month ago.
Posters pressing for the reporter to be freed will be unveiled in London, Glasgow and Edinburgh and a special TV programme will be broadcasting at the same time on BBC World and News 24, Sky and Al-Jazeera.
BBC director general Mark Thompson will cut short a holiday to travel to the Middle East to appeal for the release of the veteran journalist, who disappeared in Gaza on March 12.
Richard Porter, head of news at BBC World, said: "We wanted to produce a programme which had impact in the Middle East and around the globe and we are extremely grateful for all the co-operation shown by our fellow broadcasters.
"We don't think this has ever happened before – but all the broadcasters involved share a common aim to highlight Alan's case and to remind viewers of the dangers faced by their news teams more frequently than ever."
The TV programme will include events since Mr Johnston's disappearance and a study of life in Gaza as well as the increasing threats facing journalists working in danger zones around the world.
The BBC said it was becoming "increasingly concerned" for Mr Johnston's well-being.