Police are hunting three men after thousands of insects were released into two Byron Burger restaurants in central London last month.
Detectives have released images of the men they wish to speak to in connection with the incidents, which took place at about 7pm on Friday, July 29.
A number of unknown male suspects entered Byron Burger in St Giles High Street, Holborn, and released locusts and cockroaches onto the restaurant floor and in the male toilets, police said.
The suspects then moved onto a second branch of the chain in High Holborn where they also released insects.
On both occasions, customers were asked by staff to vacate the premises and the restaurants were closed.
Byron Burger was the focus of much anger last month after it was accused of “luring workers into a booby trap” after it was alleged it helped the Home Office deported some staff from its London restaurants.
A number of protests were held outside restaurants of the upmarket burger chain.
Police are searching for three suspects. ‘Man A’ is described as dark-skinned, of medium to heavy build, unshaven with thinning hair.
He was wearing a bulky hooded anorak, brown shoes and blue jeans, and was carrying a rucksack.
‘Man B’ is described as dark-skinned, of thin build, with long hair - tied at the back - and unshaven.
He wore thick-rimmed glasses and a black tracksuit with white stripes along the arms, and carried a bag or satchel over his shoulder.
‘Man C’ is described as dark-skinned, of thin build, with short hair and a short beard.
He was wearing a brown blazer, blue shirt and light grey or beige trousers.
Anyone who recognises any of the individuals or who has information that could assist the investigation is asked to contact the Met’s Public Order Crime Unit on 020 8246 0076.
To remain anonymous call Crimestoppers on 0800 555 111.