Pricilla Chan announces the Chan Zuckerberg Initiative to "cure, prevent or manage all disease" by the end of the century during a news conference at UCSF Mission Bay in San Francisco, California, U.S. September 21, 2016. REUTERS/Beck Diefenbach

Police officers wearing riot gear block a road during protests after police fatally shot Keith Lamont Scott in the parking lot of an apartment complex in Charlotte, North Carolina, U.S. September 20, 2016. REUTERS/Adam Rhew/Charlotte Magazine

Twelve year old Jeremiah Haskins walks past the apartment where Keith Scott lived the morning after protests against the police shooting of Scott, in Charlotte, North Carolina. REUTERS/Jason Miczek

(L-R) Reverend Joey Crutcher, father of the Tulsa motorist who was shot and killed by police Terence Crutcher, speaks while Rev. Al Sharpton, attorney Benjamin Crump and Tiffany Crutcher stand during a news conference a the National Action Network headquarters in New York, U.S., September 21, 2016. REUTERS/Shannon Stapleton

Police officers wearing riot gear block a road during protests after police fatally shot Keith Lamont Scott in the parking lot of an apartment complex in Charlotte, North Carolina, U.S. September 20, 2016. REUTERS/Adam Rhew/Charlotte Magazine

Charlotte's Mayor Jennifer Roberts speaks to reporters the morning after protests against the police shooting of Keith Scott, in Charlotte, North Carolina. REUTERS/Jason Miczek

Officer Betty Shelby of the City of Tulsa Police Department in Tulsa, Oklahoma is shown in this undated photo provided September 21, 2016. Photo courtesy of City of Tulsa Police Dept/Handout via REUTERS

Police officers wearing riot gear block a road during protests after police fatally shot Keith Lamont Scott in the parking lot of an apartment complex in Charlotte, North Carolina, U.S. September 20, 2016. REUTERS/Adam Rhew/Charlotte Magazine