Jerrie Mckenny, center left, and her sister, Tia Sexton embrace as people sing the hymn Amazing Grace Tuesday, April 28, 2015, in Baltimore, in the aftermath of rioting following Monday's funeral for Freddie Gray, who died in police custody. The streets were largely calm in the morning and into the afternoon, but authorities remained on edge against the possibility of another outbreak of looting, vandalism and arson. (Photo by Matt Rourke/AP Photo)

In this aerial photo, police stand in formation near a gathering of protestors at the intersection of North Avenue and Pennsylvania Avenue, Tuesday, April 28, 2015, in Baltimore, a day following unrest that occurred after Freddie Gray's funeral. Gray died from spinal injuries about a week after he was arrested and transported in a Baltimore Police Department van. (Photo by Patrick Semansky/AP Photo)

A man rinses his eyes after he was sprayed by police with a crowd dispersant Tuesday, April 28, 2015, in Baltimore, in the aftermath of rioting following Monday's funeral for Freddie Gray, who died in police custody. (Photo by Matt Rourke/AP Photo)

Demonstrators throw rocks at Baltimore police during clashes in Baltimore, Maryland April 27, 2015. Seven Baltimore police officers were injured on Monday as rioters threw bricks and stones and burned patrol cars in violent protests after the funeral of Gray, a black man who died in police custody. (Photo by Shannon Stapleton/Reuters)

A protester argues with police near Mondawmin Mall after Freddie Gray's funeral in Baltimore April 27, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

Protesters clash with police near Mondawmin Mall after Freddie Gray's funeral in Baltimore April 27, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

A demonstrator looks up after being sprayed with pepper spray during clashes in Baltimore, Maryland April 27, 2015. (Photo by Shannon Stapleton/Reuters)

Demonstrators jump on a damaged Baltimore police department vehicle during clashes in Baltimore, Maryland April 27, 2015. Maryland Governor Larry Hogan declared a state of emergency and activated the National Guard to address the violence in Baltimore, his office said on Monday. Several Baltimore police officers were injured on Monday in violent clashes with young people after the funeral of a black man, Freddie Gray, who died in police custody, and local law enforcement warned of a threat by gangs. (Photo by Shannon Stapleton/Reuters)

A protestor on a bicycle thrusts his fist in the air next to a line of police, in front of a burning CVS drug store, during clashes in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

A Baltimore resident (R) trying to restore order in his neighborhood speaks to a protester during clashes in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

A Baltimore firefighter pulls a hose through crowds of protestors, who later cut the hose, in front of a burning building during clashes in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

Baltimore police officers tackle and arrest looters after they emerged from a “Deals” store with merchandise during clashes between rioters and police in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

Firefigthers respond to a fire at a CVS pharmacy on Pennsylvania Avenue in Baltimore April 27, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

A Baltimore Metropolitan Police transport vehicle burns during clashes in Baltimore, Maryland April 27, 2015. (Photo by Shannon Stapleton/Reuters)

A man with looted goods walks by burned vehicles in Baltimore, Maryland April 27, 2015. (Photo by Shannon Stapleton/Reuters)

A rioter screams from atop a burning car during clashes in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

A Baltimore firefighter heads alone into a burning building set ablaze by rioters during clashes after the funeral of Freddie Grayl in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

Bricks thrown by protests lie on Reisterstown Road in Baltimore April 27, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

A police car travels on Pennsylvania Avenue in Baltimore April 27, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

Baltimore police officers chase down, tackle and arrest a woman after she and other looters ran from a “Deals” store (rear) with merchandise during clashes between rioters and police after the funeral of Freddie Gray in Baltimore, Maryland April 27, 2015. (Photo by Jim Bourg/Reuters)

A firefighter uses a saw to open a metal gate while fighting a fire in a convenience store and residence during clashes after the funeral of Freddie Gray in Baltimore, Maryland in the early morning hours of April 28, 2015. (Photo by Eric Thayer/Reuters)

A police officer stands nearby as firefighters attack a fire in a convenience store and residence during clashes after the funeral of Freddie Gray in Baltimore, Maryland in the early morning hours of April 28, 2015. (Photo by Eric Thayer/Reuters)

Baltimore firefighters pulls hoses from their truck to attack a fire set by rioters in a convenience store and residence on East Biddle street at Montford Avenue during rioting in Baltimore, Maryland in the early morning hours of April 28, 2015. (Photo by Jim Bourg/Reuters)

Baltimore firefighters attack a fire in a convenience store and residence during clashes after the funeral of Freddie Gray in Baltimore, Maryland in the early morning hours of April 28, 2015. (Photo by Eric Thayer/Reuters)

Baltimore firefighters attack a fire in a convenience store and residence during clashes after the funeral of Freddie Gray in Baltimore, Maryland in the early morning hours of April 28, 2015. (Photo by Eric Thayer/Reuters)

Gloria Darden (R), mother of Freddie Gray, gathers with family and clergy in Baltimore, Maryland April 27, 2015. (Photo by Eric Thayer/Reuters)

Baltimore state troopers stand guard on Pennsylvania avenue in Baltimore, Maryland April 28, 2015. (Photo by Shannon Stapleton/Reuters)

People clean up Pennsylvania avenue as Maryland State police stand guard in Baltimore, Maryland April 28, 2015. (Photo by Eric Thayer/Reuters)

Members of the Maryland National Guard patrol the harbor section of Baltimore, Maryland April 28, 2015. (Photo by Shannon Stapleton/Reuters)

National Guard troops patrol in front of the Power Plant in the Inner Harbor of Baltimore, Maryland, United States April 28, 2015. U.S. President Obama on Tuesday said rioting in Baltimore emphasized the need for national “soul searching” on the way police forces deal with the public. Obama, in his first public statement about Freddie Gray, a Maryland black man who died of a broken spine after being arrested, said such cases are not new. (Photo by Jim Bourg/Reuters)

National Guard troops stand watch along E. Pratt St. in Baltimore, Maryland April 28, 2015. (Photo by Eric Thayer/Reuters)

Members of the community hold hands in front of police officers in riot gear outside a recently looted and burned CVS store in Baltimore, Maryland, United States April 28, 2015. (Photo by Jim Bourg/Reuters)

Members of the community hold back a man (obscured by woman in white) who attempted to go after police officers after items were thrown and pepper spray was used outside a recently looted and burned CVS store in Baltimore, Maryland, United States April 28, 2015. (Photo by Jim Bourg/Reuters)

Members of the community stand between demonstrators and police officers after items were thrown and pepper spray used outside a recently looted and burned CVS store in Baltimore, Maryland, United States April 28, 2015. (Photo by Jim Bourg/Reuters)

A protester holds a sign with her mouth to keep her hands free near the CVS Pharmacy building on Pennsylvania Avenue in Baltimore April 28, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

Police in riot gear block a street near the CVS Pharmacy building in Baltimore April 28, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

A protester yells “register to vote” near the condemned CVS Pharmacy building on Pennsylvania Avenue in Baltimore April 28, 2015. (Photo by Sait Serkan Gurbuz/Reuters)

Members of the community lie down in the street, forcing a police armored vehicle to reverse back down the street in Baltimore, Maryland, April 28, 2015. (Photo by Jim Bourg/Reuters)

Young men pop a wheelie, or perform a stunt, along W North Avenue and Pennsylvania Avenue and near the site of a protest against the death of 25-year-old black man Freddie Gray who died in police custody in Baltimore, Maryland on April 28, 2015. Baltimore's mayor came under criticism on Tuesday for a slow police response to some of the worst urban violence in the United States in years in which shops were looted, buildings burned to the ground and 20 officers were injured. (Photo by Adrees Latif/Reuters)

A demonstrator stands in front of the police line on the corner of W North Avenue and Pennsylvania Avenue, a day after it was looted and set ablaze in protest for the death of 25-year-old black man Freddie Gray who died in police custody in Baltimore, Maryland April 28, 2015. (Photo by Shannon Stapleton/Reuters)

Residents dance to the drums of a community band near the corner of W North Avenue and Pennsylvania Avenue as others nearby protest (unseen) the death of 25-year-old black man Freddie Gray who died in police custody in Baltimore, Maryland April 28, 2015. (Photo by Adrees Latif/Reuters)

A police armoured car is pelted with garbage as it moves down a street as clouds of smoke and crowd control agents rise shortly after the deadline for a city-wide curfew passed in Baltimore, Maryland April 28, 2015, as crowds protest the death of Freddie Gray, a 25-year-old black man who died in police custody. (Photo by Shannon Stapleton/Reuters)

Residents clean streets as law enforcement officers stand guard, Tuesday, April 28, 2015, in Baltimore, in the aftermath of rioting following Monday's funeral of Freddie Gray, who died in police custody. (Photo by Matt Rourke/AP Photo)