Humanitarian aid groups have promised to continue their work in Afghanistan after militants murdered ten medical aid workers August fifth. Officials say the seven men and three women worked for the Christian aid group, International Assistance Mission. They were returning to Kabul after a trip to Nuristan province to provide medical care and supplies. Those killed were six Americans, one German, one Briton and two Afghans. The Taliban claimed responsibility for the attack. It accused the aid workers of being spies and spreading Christianity. Violence against aid workers has increased in recent years, even though international laws are supposed to protect them. Seventeen aid workers were killed in the first half of this year in Afghanistan. Nineteen others were kidnapped. In Pakistan, seven aid workers from the Christian group World Vision were killed during an attack on their office in March. Officials believe militants were responsible for the attack. The Humanitarian Policy Group has been studying violence against aid workers for more than ten years. The group released its latest report on the issue last year.Abby Stoddard works with the international research group Humanitarian Outcomes. She helped write the policy group report. The report says that in two thousand eight, two hundred sixty humanitarian aid workers were killed, kidnapped or seriously injured in violent attacks. This was the highest number of incidents since the group began doing the research twelve years ago. Mrs. Stoddard says more than sixty percent of the incidents took place in three countries. She said there has been an increase in major attacks against aid workers. But this has been driven by the extremely violent environments in Afghanistan, Somalia and Sudan, especially the Darfur area of Sudan.Sri Lanka, Chad, Iraq and Pakistan also had many cases of violence against aid workers. Abby Stoddard says ongoing conflicts in the countries increase the risk of violence against aid workers. Mrs. Stoddard called the recent murders in Afghanistan horrific. But she said they are not uncommon. She says incidents involving nationals instead of foreigners do not get the same level of attention. And that’s the VOA Special English Development Report.