This comes after negotiations between the authorities and people from St Louis to calm the situation.
Clean-up operations were abandoned yesterday when a group of young people stole one of the trucks which has now been returned.
On Sunday, clashes between armed youths and police near St Louis left six police officers injured and prompted the authorities to keep the road closed while trying to negotiate a resolution.
The unrest was triggered after police fatally shot a prison escapee from St Louis in the early hours of Saturday.
