Sambrook, who is setting up a special committee of the International News Safety Institute to look into the problem, said: "Much of the debate centres around Iraq, but the Philippines is an area of concern, as is Columbia and Nigeria. We all say how bad it is but we never see whether we can actually do anything about it.
"We want to find out what's driving the increase, what the reasons are and whether there are any solutions."
The committee plans to look at evidence from previous investigations and hold a series of fact-finding meetings to ask journalists about their experiences.
One will be held in London in June, with the date to be confirmed, and the committee is expected to report in around one year's time.