THIEVES who target firms, schools and hospitals have stolen nearly 100 computers.
Since the beginning of June, 94 computers have been taken from around the Huddersfield area.
Police are urging organisations to be extra-careful if they leave computers in offices overnight or at weekends.
The public are also being told to be wary of anyone selling computer equipment.
Pc Dave McSweeney, of Huddersfield police, said organisations needed to be extra-vigilant to stop the crime trend.
He added: "Colleges, schools, businesses - and even hospitals - have been targeted. A very large number of computers have been stolen.
"People need to be aware that thieves seem to be actively looking to steal computers.
"Measures need to be taken to make it as hard as possible for the criminal," said Pc Mc- Sweeney.
"If a company does not have an alarm system, then now might be the time to consider stepping up security and protecting themselves."
There are fears that the computers might be sold through the black market to unsuspecting members of the public.
"The message has to be `don't buy things from people offering something if you have any reason to think it may be stolen'," said Pc McSweeney.
"People need to be on their guard to make sure they are not inadvertently buying stolen goods."