#BBCtrending: Activists film police restraining pregnant woman

Last month, police in Brooklyn, New York, were captured on film as they threw a pregnant woman to the ground, belly down. That video received hundreds of thousands of views.

As camera phones and social media become more ever-present, filming the police has become a tool for activists and those worried about police brutality.

'Copwatch' organisations across the country train civilians to use their phones to monitor police.

Filmed and edited by Anna Bressanin

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