Aid Crisis in Central African Republic Worsens, U.N. Says GENEVA - The number of people displaced by fighting between Muslim and Christian militias and vigilantes in the Central African Republic has more than doubled in the past month, and increasing violence is making it harder to deliver humanitarian relief, the United Nations warned on Friday. More than 935,000 people have been driven from their homes in the clashes between Christian militias and the mainly Muslim Seleka rebel group that overthrew President François Bozizé in March, up from around 400,000 at the start of December, said Babar Baloch, a spokesman for the United Nations refugee agency. In the past month, relief supplies have reached about 23,000 people, he said. A month after France sent additional troops to the Central African Republic to join African peacekeepers trying to restore stability, the violence is getting worse, "making the delivery of humanitarian relief ever more difficult," Mr. Baloch said. "Targeted attacks against civilians, looting and the presence of armed elements at some displacement sites have severely limited humanitarian access to those in need of urgent assistance," Mr. Baloch said. We have heard about a lot of revenge attacks. Some attacks have taken place inside health clinics. In Bangui, the capital, where the year began with gun battles between the factions, around 512,000 people - more than half the population - have fled their homes and more than 100,000 have sought shelter and protection around the airport, where aid agencies are delivering emergency supplies. The presence of a French Army contingent providing security at the Bangui airport has not helped relief agencies trying to distribute aid, a task that has become "more challenging," Mr. Baloch said. In addition, the World Health Organization reported on Friday an outbreak of measles in Bangui as well as in the north of the country and said it was working with the medical charity Doctors Without Borders to start an emergency vaccination program. Doctors Without Borders reported that fighting had forced it to curtail operations at the Bangui airport. Clashes on Tuesday and Wednesday killed two children and wounded 40 people, the organization said. "There has been heavy fighting just around the clinic," said Niklas Bergstrand, a spokesman for the organization in Brussels. It's basically too dangerous with bullets flying. Doctors Without Borders had planned to open two new health posts to provide support for vaccination and nutritional programs but suspended those plans and will operate with only an emergency team, Mr. Bergstrand said.