About two dozen students in northern Mozambique fainted en masse during classes.
Pemba Secondary School, in province of Cabo Delgado, confirmed that the fainting spells had mainly affected girls during lessons on Wednesday.
Officials say those affected by what seemed to be a contagious phenomenon showed signs similar to those of an epileptic attack.
The students all recovered and are reported to be well.
Provincial chief physician, Edson Fernando, said it may be related some kind of hysteria causing a ripple effect of emotion.
This was not the first time there have been spells of mass fainting at schools in Mozambique, with incidents further south in 2010 and 2018.
Traditional healers, psychologists and sociologists were called in to investigate.
Source: BBC