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Police and protesters clash over public transportation in Bogota

Fredy Builes / Reuters

A riot police officer attempts to take cover behind a passerby making a recording of the scene on his mobile phone, from protesters throwing stones during a student demonstration against what they say is the poor service of the TransMilenio bus rapid transit system in Bogota on March 9.

Fredy Builes / Reuters

Students take cover from tear gas canisters fired by riot police during a protest against what they say was the poor service of the TransMilenio bus rapid transit system in Bogota on March 9.

William Fernando Martinez / AP

A cyclist walks past a bus station that was damaged by protesters in Bogota, Colombia, on March 9.

Thousands of student clashed with police during spontaneous protests against the public transport system TransMilenio, in Bogota, Colombia. Protesters blocked bus lanes and stalled the city's traffic demanding improvements to public transportation. The demonstrations, which began early in the morning, saw 30 people detained, smashed windows and automotive traffic chaos.

-- Msnbc.com wire services contributed to this post