The unrest is in response to the police shooting of unarmed teenager Michael Brown over the weekend.
Further inflaming tensions, a policeman shot and critically wounded a man Tuesday night who authorities say pulled a handgun on the officer. In a separate incident, another person was injured in a drive-by shooting, but it is not clear if it was related to the protests.
The latest violence is prompting the police department to ask protesters not to assemble after dark.
In a written statement the Ferguson Police Department said "We are working to restore confidence in the safety of our community and our neighborhoods so that we may begin the healing process."
There are conflicting reports surrounding what lead up to the shooting Saturday.
Eyewitnesses are denying claims by police that there was a physical confrontation between Brown and the officer before Brown was shot. The officer has told investigators he was pushed into the patrol car as Brown tried to go for the officers gun.
Witnesses say Brown was shot in the street, unarmed, with his hands up.
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