They are held on suspicion of activities challenging Chinese rule in Tibetan areas.
Police also hold several other Tibetans who gathered in support.
Thousands of monks and nuns are holding mass prayer sessions for the deceased protester.
He set himself on fire in front of Chinese security offices placed outside his monastery.
A young woman of 'good character' dies in a challenge to Chinese rule.
Authorities offer 'compensation' payments on condition of family's silence over the event.
Tibetans should follow the wishes of exiled spiritual leader the Dalai Lama, he said.
The number of Tibetan burning protests against Chinese rule rises to 134.
He had worked to promote Tibetan culture and unity in a troubled county in Tibet.
He had also urged young Tibetans to 'hold to their pride' in being Tibetan.
Authorities had insisted that a government-favored candidate be elected to local office.
He had brain injury and vomited blood just before Chinese authorities released him to his family.
He was returned to his home this week before completing his sentence of two-and-a-half years.
His imprisonment for two and a half years is seen as part of Beijing’s crackdown on Tibetan cultural figures.