Two guinea pigs were found dead at the home of poisoned spy Sergei Skripal after the property was sealed off for investigations.

The Department for Environment, Food and Rural Affairs added a cat was also found in a distressed state at the house and a decision was taken to euthanise the pet.

Tensions between Russia and the United Kingdom have been high since Mr Skripal and his daughter Yulia were found unconscious on a park bench in Salisbury last month.

Scotland Yard said Mr Skripal and his daughter first came into contact with the nerve agent at his home after detailed forensic testing showed the highest concentration of the substance was found on the front door.