Baltimore police on Saturday arrested 12 people after a dwindling protest over the police custody death of Freddie Gray descended into violence. An estimated 2,000 people marched peacefully for hours hours before a small splinter group began hurling rocks, smashing windows, and scuffling with police. Protesters also tangled with bystanders and police outside Camden Yards during a game between the Orioles and Red Sox, prompting the city to ask fans to remain inside the venue until authorities cleared the scene. "I am profoundly disappointed to see the violence in our city this evening," Baltimore Mayor Stephanie Rawlings-Blake said. The city has suspended six officers while investigating how Gray suffered a fatal spinal injury while in police custody.