Minority groups have several grievances against the government
The New York-based group Human Rights Watch has accused Vietnam of repressing a minority Christian community in the Central Highlands.
The group said dozens of Montagnards were missing after security forces used electric truncheons, tear gas and water cannon to disperse a weekend protest.
Human Rights Watch said that some protesters were beaten to death, while many others were still missing.
The Vietnamese government has denied the allegations.
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