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Baltimore police officers targeted by rock-throwing protesters on Monday appeared to hurl projectiles toward crowds on at least two occasions.

One photo shows a projectile, possibly a rock or piece of concrete, leaving an officer's hand.At least seven officers were injured Monday as protesters launched rocks, bricks and other objects at police. Some of the projectiles were reportedly heavy enough to break police riot shields. Baltimore police Capt. Eric Kowalczyk said one of the officers who had been hit was "unresponsive," and others had "broken bones."

Kowalczyk suggested police would deploy traditional riot-dispersing tools. "You're gonna see tear gas, you're gonna see pepper balls," he said.

Police didn't immediately answer a request for comment about the photos of officers throwing projectiles.