A man suspected of contaminating food “with a number of needles” at three supermarkets in west London has been arrested.
He is alleged to have visited Tesco, Waitrose and Sainsbury’s on Fulham Palace Road and injected products believed to be processed meat and microwaveable items.
Police said it is not yet known how many items were affected or what substance was used.
Investigations are ongoing to establish if other businesses in the area were affected.
Officers were called just before 8pm on Wednesday after the man was reported to be shouting at people in the street, Hammersmith & Fulham Council said.
He was taken into custody and accused of trying to cause public harm or anxiety.
The supermarkets have been closed and crime scenes are in place.
Metropolitan Police said in a statement that the man allegedly “injected foodstuffs with a number of needles” at the Tesco Express at 168-188 Fulham Palace Road, the Little Waitrose at 201-207, and the Sainsbury’s Local at 179-183.
The council issued an “emergency alert” notice on its social media accounts on Wednesday night.
It urged the public “as a precaution to dispose of any food items bought from these supermarkets this evening” and said its environmental health team was working with the shops affected.