A 28-year-old man was arrested on suspicion of inserting a needle into bread at a convenience store in Nagareyama, Chiba Prefecture, police said Thursday amid a spate of food-tampering cases there.

Tomoya Nagaki, described as an unemployed resident of Nagareyama, was held for allegedly inserting a 4-cm needle into a loaf of bread at a Seven-Eleven on June 28, police said.

Police found Nagaki in Kashiwa, Chiba Prefecture, on Wednesday night after a man resembling him was recorded on a store security camera jabbing a loaf of bread. Nagaki admitted to the crime but claimed not to remember why, the police said.