Nationwide protests reignited over US police killings

Protesters across the US have marched against police killings following two high-profile cases of white officers killing black men.

Hundreds of demonstrators briefly shut down a meeting in San Francisco City Hall on Tuesday.

Marchers in New York stopped traffic on the Brooklyn Bridge and there were scattered arrests in smaller cities.

Meanwhile, a new dashcam video of an officer hitting an armed suspect with a vehicle in Arizona became public.

Mario Valencia, 36, who was being pursued by police for multiple robberies and assaulting an officer, survived the collision.

The protests across the US on Tuesday came after two cases of unarmed black men killed by law enforcement in a week.

Walter Scott, a 50-year-old, was shot in the back and killed in South Carolina.

Eric Harris, 44, was shot and killed when a 73-year-old reserve deputy said he accidently drew his gun instead of a Taser.

There have been demonstrations about police use of excessive force, ever since a black unarmed teenager was shot dead in Ferguson, Missouri, last summer.

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