Hundreds of people headed to London's Chinatown on Thursday after an advert promised a COVID-19 vaccination without an appointment and with no ID checks.
Footage showed crowds of people gathered after an official advert posted on the Chinese Information and Advice Centre website said jabs would be offered on a "vaccine bus".
Similar strategies are being used around the UK in areas where take-up has been low.
"A Vaccine Bus is available in London Chinatown to offer free vaccine jab to the Community without appointment. Date: 27 May 2021 (Thursday) Time: 12 - 5pm," the advert said.
"You DO NOT need to have: NHS number any proof of address personal identification Undocumented migrants also welcomed Stay safe! Get vaccinated!"
The bus is run by Westminster Council and is an official service offered by the government and NHS.
Currently, coronavirus vaccinations can only be booked via the NHS website or at a GP surgery.
Those who are not yet eligible have been told to wait to be contacted.