The Chinese tourist who posted a video clip showing three Thai police officers offering her a shortcut through immigration and a police escort to her hotel in Pattaya has already left the country, the Tourist Police Bureau (TBP) said on Thursday.

Responding to growing calls for the police to prosecute the tourist for accepting the officers' offer, the TPB said it has to act with caution, to protect relations between the two countries.

The TPB has received numerous tip-offs from the public, many of which showed online advertisements for similar services. "We are investigating to find out who is responsible [for the advertisements]," a TPB spokesman said.

In related news, a Pheu Thai Party MP criticised Prime Minister Prayut Chan-o-cha and the Tourism and Sports Minister for failing to answer questions surrounding the Thailand Elite Card scheme.

Recent findings showed the Elite Card had been sold to several Chinese citizens which authorities suspect are part of a transnational crime syndicate.

As Elite Card holders, these individuals were able to purchase properties and access privileges including fast-track immigration clearance.

A Move Forward Party MP said he had evidence to prove a relative of Prayut was involved in illegal activities conducted by a Chinese criminal syndicate.