Police officers used tear gas and stun grenades to disperse the crowd who were protesting against the death of the Black teenager Micheal Brown, who was shot by a White policeman on Aug 9.
Reports suggest that protestors threw rocks at the police officials, who then retaliated with tear gas and stun grenades. Police arrested four people from the protest.
Meanwhile, Governor Nixon called on the National Guard to be deployed to end the chaos which resulted in the looting and destroying of stores. President Barack Obama said that the violence must come to an end and urged people to maintain peace in the area.
"While I understand the passions and the anger that arise over the death of Michael Brown, giving to that anger by looting or carrying gun, or even attacking the police serves to raise tensions and stir chaos," he said at a press conference.
Brown's autopsy reports on Monday had revealed that Brown was shot six times, including two bullets in the head.