Moroccan police have arrested a teenage boy and girl for posting a photo on Facebook of them kissing.

"It involves a teenage boy and his girlfriend. They were arrested on Thursday for violating public decency by posting a photo of them kissing," said Chakib al-Khayari, president of the Rif Association of Human Rights. Morocco is a Muslim country, where modest dress is required and where public displays of affection are forbidden.

The photograph was taken outside the Nador high school where the two are students. The teenagers are being held in the juvenile detention centre in Nador, where a sit-in has begun to demand their release, Khayari said.

A number of other couples have posted similar photos on their Facebook pages.