tell contractors they will be targeted by the militant Animal
Liberation Front group if they undertake work for the university.
where tests on animals will be carried out.
In July last year Montpellier subsidiary Walter Lilley abandoned a project to build an £18 million research laboratory in Oxford after shareholders were targeted by militant animal rights groups.
Detectives believe it is likely other people may have also been
targeted, but chose not to report the letter to the police.
A police spokesman said: 'It is believed the letters are part of a
campaign by animal rights extremists who are trying to prevent work
by Oxford University to build new laboratories.
'Although everyone is entitled to an opinion about this very
emotive issue, it is just not acceptable to act in a way which
intimidates other people and threatens their livelihood.'
A number of demonstrations have already been held at the new
laboratory site, where tests will mainly be carried out on rodents