Eric Garner death: US grand jury system 'broken'

Civil rights leader Reverend Al Sharpton has labelled the US grand jury system "broken" and called on the federal government to address it.

Earlier the US justice department said it will investigate the death of a black man placed in an apparent chokehold by a New York police officer.

Activists have called for a march in Washington next week as a result.

A federal probe into police in Cleveland found a pattern of "unreasonable force".