The security chief of the Covid-19 fighting agency warned people who do not follow social distancing rules on Sunday, after fans mobbed a cinema.

His warning was issued after fans thronged Paragon Cineplex on Friday evening for a meet-and-greet event with Anan "Ying" Wong and Wanarat "War" Ratsameerat. The actors have appeared together in many TV series, with En of Love the latest.

Photos on social media showed fans of the duo packed together to take photos with the actors, ignoring social distancing rules.

Any businesses violating the measures against Covid-19 will face the maximum legal penalty, said the head of security for the Centre for Covid-19 Situation Administration (CCSA).

Siam Piwat Co, the operator of Siam Paragon, on Saturday ordered the cinema in the shopping centre to close for three days from Sunday to improve safety and health measures. It also apologised for the "inappropriate" use of the space, resulting in safety rules set by the company being ignored.

Cinemas are among the mild-risk businesses allowed to reopen on June 1 after a decline of new coronavirus patients and deaths in the country. But they have been ordered to maintain safety measures as the restrictions are eased.