Protests over Missouri teen's death

Police officers detain a demonstrator for protesting Michael Brown murder in Ferguson, Missouri August 18, 2014.

Police officers detain a demonstrator for protesting Michael Brown murder in Ferguson, Missouri August 18, 2014.

Police prepare their riot gear and weapons in anticipation of protests in Ferguson, Missouri, August 18, 2014.

Brown family attorney Daryl Parks points on an autopsy diagram to the head wound that was likely fatal to Michael Brown during a news conference in Ferguson, Missouri August 18, 2014.

Police officers detain a demonstrator for protesting Michael Brown murder in Ferguson, Missouri August 18, 2014.

National Guard troops arrive at a mall complex that serves as staging for the police in Ferguson, Missouri, August 18, 2014.

Police officers keep an eye on demonstrators protesting Michael Brown murderin Ferguson, Missouri August 18, 2014.

Protesters react to the effects of tear gas which was fired at demonstrators reacting to the shooting of Michael Brown in Ferguson, Missouri August 17, 2014.

Tear gas rises from the ground after having been fired upon protesters who are continuing to react to the shooting of Michael Brown, in Ferguson, Missouri August 17, 2014.

A protester picks up a gas canister to throw back towards the police after tear gas was fired at demonstrators who are continuing to react to the shooting of Michael Brown in Ferguson, Missouri August 17, 2014.

Demonstrators gesture and chant as they continue to react to the shooting of Michael Brown in Ferguson, Missouri August 17, 2014.

Police officers line up across the street as they maintain their distance from protesters during on-going demonstrations to protest against the shooting of Michael Brown, in Ferguson, Missouri, August 16, 2014.

Ferguson Police Chief Thomas Jackson announces the name of the officer involved in the shooting of Michael Brown as officer Darren Wilson, in Ferguson, Missouri August 15, 2014.

Demonstrators protest outside of Greater St. Marks Family Church in Ferguson, Missouri August 14, 2014.