People march holding posters of the missing students
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Mexico missing case: Students march in solidarity

Thousands of Mexicans have been marching through the streets of Mexico City to protest against the pace of investigations on the whereabouts of 43 missing student teachers.

They disappeared after clashing with police in the south-western state of Guerrero more than five weeks ago.

University students have begun a 72-hour strike in support of the teachers.

The mayor of Iguala, suspected of involvement in their disappearance, was arrested on Tuesday after a manhunt.

Will Grant reports.

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