Police are hunting raiders who smashed their way into a Birstall financial services building and made off with 22 Tulip Compaq computers worth £11,000.
The incident at Alex Lawrie Factors in Bankwood Way, Birstall, took place from 9.05pm and 9.07pm on Monday.
The burglars approached the premises with a vehicle and broke the glass front door with a road sign.
They then used fire extinguishers to smash their way through the building, using them to prop open doors as they went.
A police spokesman said the offenders made several trips in and out of the building removing property.
"Anyone who is offered these computers for sale, or the hard drives or microchips, should contact the police," he added.
Anyone with information about the gang should contact Dewsbury police helpdesk on (01924) 431059.
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