Protests broke out in at least two Tibetan-populated towns in Gansu this week as middle-school students took to the streets on the anniversary of deadly rioting two years ago.
The protests took place despite tight security in Tibetan-populated areas ahead of the March 14 anniversary.
At least 20 slogan-chanting students from Machu county's Machu Tibetan Secondary School marched to the county government headquarters on Sunday, a witness said yesterday.
He said the students waved snow lion flags as they protested. The flag is used by the Tibetan government in exile in India but is outlawed by mainland authorities.
'They chanted slogans in Tibetan that I don't understand and two of them also waved a banner with Tibetan characters,' he said.
He said the student protest, which started out from the school at about 1pm, drew the attention of crowds on the streets and left many non-Tibetan vendors and businessmen scrambling to close their shops.