While teenagers in many countries treat the day as an occasion to declare their love for classmates, in the Indonesian city of Surabaya it was a different story as students from one school staged the noisy demonstration.
"Say no to Valentine!" chanted the students, who were aged between 13 and 15 and included many girls wearing headscarves.
It was the latest expression of anger at Valentine's Day in the world's most populous Muslim-majority country, where Islamic clerics and some pious Muslims typically use the occasion to target what they see as Western decadence.
Ida Indahwati Waliulu, headmaster of the school which is run by an Islamic organisation, added: "There is a certain pride about this positive action carried out by the students."
As well as the demonstration, several cities across the country banned people from celebrating the occasion.
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