ST. PAUL, Minn. (AP) — Police say arrests have been made during a protest that shut down part of Interstate 94 in St. Paul, after protesters began throwing fireworks, rocks and bottles.

The interstate was blocked following a march that started outside the governor's mansion, where protesters have gathered since the fatal police shooting Wednesday night of Philando Castile. The 32-year-old black man was shot during a traffic stop in suburban St. Paul.

St. Paul police said on the department's official Twitter account that an officer was injured by a firework thrown by protesters. Police said protesters also were throwing objects and liquids at officers from highway overpasses.

Police said some protesters sat down after being warned they were subject to arrest if they didn't disassemble.

Police didn't immediately say how many people were arrested.