He said about 30 people had been killed in Bossangoa, most of them civilians. Kodegue, the presidential spokesman, accused the assailants of targeting Muslim civilians, though Rigobert said the casualties may have included Christians as well.
Seleka is composed primarily of fighters from the country's predominantly Muslim north, and some observers have said the group only targets Christian villages. Because Djotodia and many of his supporters are Muslim while Bozize and many of his supporters are Christian, the politics fall along religious fault lines.
The clashes in Bossangoa prompted about 30,000 residents around 80 percent of the town's population to flee into the forest, said Amy Martin, head of the United Nations humanitarian mission in Central African Republic.
She said the clashes also coincided with violence in two other locations in the west. Fighting in the nearby town of Bouca on Monday morning prompted residents to flee, she said. It was not clear what sparked violence in that town. The northwest town of Paoua, meanwhile, had received thousands of people fleeing clashes between self-defense groups and Seleka in surrounding areas. Around 3,000 displaced people had been registered in Paoua, according to Martin.
Last week the U.N. refugee agency said seven villages near Paoua were burned to the ground. Melissa Fleming, the agency's chief spokesperson, said the north appeared to have descended into lawlessness.
"We are, in general, increasingly worried about the civilians caught in the middle of the fighting and who are at the mercy of anyone with a gun," she said.
Martin, the U.N. humanitarian official, noted that the fighters squaring off against Seleka had not identified themselves, making it impossible to establish their origins and motivation. But she said it appeared that groups that had previously been disarmed were involved in the fighting.
Aid groups have been warning for months that Central African Republic is on the verge of a humanitarian catastrophe if the security situation doesn't improve.
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Corey-Boulet reported from Dakar, Senegal.