Pigs have been blown up, guinea pigs poisoned and marmosets given anthrax in germ and chemical warfare experiments at the top secret British military research base, it has emerged.
The campaign group that uncovered the details of the 'cruel and grotesque' research projects by scientists at the Porton Down labs in Wiltshire said that in some cases it appeared the animals had been given nothing to ease their pain.
Many of the experiments involved substantial suffering and led to the death of the animals, the British Union for Abolition of Vivisection's investigation found.