Missouri Governor Jay Nixon announced that he is lifting the curfew on the town of Ferguson after days of clashes between police and protesters over the killing of a black teenager by an officer.
The curfew was brought in on Saturday after protests following the shooting of Michael Brown became violent.
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The president-elect also warned US companies they would face "retribution" for setting up their business operations abroad.
Penalties of £100 or a court fine of up to £1,000 can now be handed to anyone caught lighting up in a private vehicle with someone under 18.