Thailand’s military government warned women on Monday against posting photos of the lower half of their breasts – a current social media trend – saying their actions could violate the country’s computer crime laws.

Thailand’s Computer Crimes Act 2007 bans material that causes “damage to the country’s security or causes public panic” or “any obscene computer data which is accessible to the public”.

The culture ministry said offenders faced up to five years in jail, but did not say how they would identify the culprits.

“When people take these ‘underboob selfies’ no one can see their faces,” ministry spokesman Anandha Chouchoti said. “So it’s like, we don’t know who these belong to, and it encourages others to do the same.