BANGKOK — Radical Buddhist groups are preventing doctors from delivering assistance to areas of western Myanmar affected by intense sectarian violence, an international medical charity said Monday.

The group, Doctors Without Borders, reported that many of its local staff members were afraid to work at refugee camps and medical centers in Rakhine State, where people wounded in clashes need treatment for wounds from guns, knives, arrows and other weapons.

“I’ve never experienced this degree of intolerance,” Joe Belliveau, the operations manager for Doctors Without Borders, said by telephone. “What we really need is for people to understand that giving medical aid is not a political act.”

The violence dates to June, when long-simmering resentment toward Muslims, some of whom come from Bangladesh, erupted after Muslims were accused of the rape and murder of a Buddhist girl. More than 70,000 Muslims fled their homes; most remain in the refugee camps. Another spasm of violence late last month left 89 people dead and displaced an additional 35,000, according to the United Nations.