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By Serene Luo
THE United States authorities are warning travellers to the US against using third-party websites that charge for a service that is provided free.
From Jan 12, citizens from countries granted visa waivers, which includes Singapore, must apply online for permission to enter the US before they fly there.
Both information and applications about the Electronic System for Travel Authorisation (ESTA), are provided free by the US Department of Homeland Security.
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