Security forces have launched operations to assess the situation and locate the missing pupils.
Nearly 1,000 women were raped and 137 murdered in the first three months of this year.
María Corina Machado may not be able to return if she goes to Norway for prize-giving, attorney general says.
María Corina Machado may not be able to return if she goes to Norway for prize-giving, attorney general says.
The coastal cities of Hoi An and Nha Trang, and a key coffee-producing belt, are among the worst-hit.
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