Seven staff have been killed across the impoverished former French colony.
Since the end of June thefts, break-ins and lootings have surged in many towns including Kaga Bandoro.
Six humanitarian groups working in the north of the troubled Central African Republic on Wednesday halted operations to protest violent attacks against their personnel.
Baptise Hanquart of the charities' umbrella organisation CCO said 32 incidents had been recorded, including 21 since June, in the market town of Kaga Bandoro alone.
Seven staff have been killed across the impoverished former French colony -- one of the most dangerous for aid workers in the world -- since the start of the year, according to the International NGO Safety Organisation (INSO).
Aid organisations present a "financial opportunity for armed groups", Hanquart said, while vowing they would not "abandon their commitment to the people" of the Central African Republic.