Calls for US to address killings as protestors stage ''die in'

Protests across the United States against police killings of unarmed black men have continued, with calls for nationwide dialogue and a “die in” in one city.

The deaths of Michael Brown, 18, in Ferguson, Missouri, and Eric Garner, 43, in New York City led to “two of the worst weeks” in modern American history, Philadelphia mayor Michael Nutter said.