Houses, cars, and livestock are swept away, but no deaths are reported.
The order so far affects only residents coming from the neighboring Tibet Autonomous Region, sources say.
Khenrab Tharchin served five years in prison for refusing to denounce the Dalai Lama when he was a monk at Dingri Shelkar Choedhe monastery.
Rinzin Dolma hanged herself because of the government-ordered destruction of the religious academy.
Chinese authorities block religious observances and a horse race to punish noncompliance with their orders, sources say.
After months with no news, family members learn he is being held at a prison in Sichuan's Ngaba prefecture.
Social media and phone calls are closely monitored, as authorities search for people who may have already sent images outside the area.
Family members were not allowed to attend the trial or hire a lawyer to present his case.
Security forces are deployed at the work site and in neighboring counties to suppress potential protests.
Chinese authorities ordered her not to discuss the death or send information to contacts outside the area.
He had spoken out while under supervision after completing a lengthy term in prison.
Nyima Lhamo had knowledge of the circumstances surrounding Tenzin Delek Rinpoche's July 2015 death in prison.
He and others had celebrated the exiled spiritual leader's birthday in online conversations.
He had been jailed for two and a half years for supporting a self-immolation protest against Chinese rule.
Detained by police last November, he is found 'languishing' in a prison in Sichuan, a local source says.
She was taken into custody after holding up a photo of the Dalai Lama while walking down a road in the county seat.
Villagers risk punishment for show of loyalty to the exiled spiritual leader reviled by communist authorities.