Police and health officials in Ueda, Nagano Prefecture, said Monday that around 300 students suffered food poisoning at a soccer and rugby tournament. Of those, 120 were taken to hospital but none suffered any lasting effects, police said.

According to police, players taking part in an elementary school soccer and rugby tournament started vomiting and complaining of stomach pain at around 1 p.m. Sunday, TV Asahi reported.

Police suspect the cause of the food poisoning may have been in some of the bentos (boxed lunches), which all came from the same supplier.