Members of the Baltimore Police Department watch a news conference from the entrance to the department's Western District police station, Friday, April 24, 2015, in Baltimore. Protestors have gathered in front of the station this week in reaction to Freddie Gray's death from spinal injuries about a week after he was arrested and transported in a police van. (AP Photo/Patrick Semansky)
Philadelphia Police Department Police Commissioner Charles Ramsey, left, Baltimore Police Department Commissioner Frederick H. Bealefeld III, center, and Detroit Police Chief Ralph Godbee, right, enter the House Judiciary Committee room to show support for U.S. Attorney General Eric Holder as he testifies about "Fast and Furious" a federal gun sting which allowed weapons to go to Mexican drug cartels through straw buyers, Thursday, December 8, 2011. (Andrew Harnik / The Washington Times)
** FILE ** This photo provided by the Baltimore Police Department on Tuesday, Aug. 18, 2009, shows Calvin Lockner. Lockner faces charges including armed carjacking and armed robbery in the beating of James Privott last August while the victim was fishing in a south Baltimore park. (AP Photo/Baltimore Police Department, File)