Its territory in the southern province of Shabwa straddles a vital oil pipeline.

该部落的地盘位于南部的舍卜沃省，横跨在生死攸关的石油管道上。

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The officials told CNN the teacher was most likely taken to Shabwa, a south-central province.

CNN: Swiss teacher kidnapped in Yemen

Officials said people belonging to the Biahan tribe of Shabwa province are demanding the release of two prisoners.

CNN: Swiss teacher kidnapped in Yemen

The woman was seized on Wednesday in Hodeida on the west coast, where she works as a teacher, but is reportedly being held in Shabwa province.

BBC: Swiss woman kidnapped in western Yemen