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CCTV images have been released of three men suspected of being involved in a protest that saw cockroaches and locusts released into branches of the Byron burger chain .

Demonstrators targeted two of the restaurants on July 29 in the wake of Home Office immigration raids that saw dozens of workers arrested.

Scotland Yard said a group of men released the insects onto the floor and in the men's toilets at Byron on St Giles High Street, Holborn, before moving on to another branch in High Holborn and setting the pests free there.

The restaurants had to be cleared of customers and closed while the insects were dealt with.

(Image: Met Police)

One of the suspects, dubbed Man A, is dark-skinned, medium to heavy build, and was unshaven with thinning hair. He was wearing a bulky hooded anorak, brown shoes and blue jeans, and was carrying a rucksack.

(Image: Met Police)

Another, Man B, is thin and dark-skinned, and was unshaven with long hair that was tied back. He wore thick-rimmed glasses and a black tracksuit with white stripes along the arms, and carried a bag or satchel over his shoulder.

(Image: Met Police)

Man C is also thin and dark-skinned, with short hair and a short beard. He was wearing a brown blazer, blue shirt and light grey or beige trousers.

Anyone with information can call the Met's Public Order Crime Unit on 020 8246 0076, or Crimestoppers anonymously on 0800 555 111.