HONG KONG — More than a week after attacks on police officers began a wave of bloodshed in western Myanmar, a lockdown by security forces has prevented aid workers from operating in the area, and new videos of what appear to be local Muslims calling for resistance have raised fears of more violence.

Maj. Gen. Aung Soe, the deputy minister for home affairs, told reporters on Monday in Naypyidaw, the capital, that 30 attackers had been killed in Rakhine State since the Oct. 9 assaults on three border posts that left nine police officers dead. Activists from the Rohingya ethnic group, a persecuted Muslim minority who number more than a million in Rakhine, have accused the security forces of waging a counterinsurgency campaign against civilians, and they have circulated photos that they say show security forces burning Rohingya homes.

Neither the government’s nor the activists’ version of events could be independently verified. But an advocacy group, Fortify Rights, recently said that it had interviewed witnesses who described what appeared to be extrajudicial killings by the military.