Police are on the hunt for a gang of six men wanted over daring smash and grab robberies on Perth's two Apple stores.

The thieves got away with a $300,000 haul of products, mostly Apple iPhones, prompting a warning for customers buying off the black market.

The thieves got away with a $300,000 haul of products, mostly Apple iPhones, prompting a warning for customers buying off the black market. (9News)

The thugs targeted the Hay Street store in Perth's CBD at 2.17 on Tuesday morning, smashing their way in with a sledgehammer.

The gang was caught on security camera fleeing the scene empty handed after they were disrupted by a taxi driver.

At 2.55 AM the thieves then broke into the Garden City Apple store in Booragoon, leaving with a huge haul of goods.

The gang was caught on security camera fleeing the scene empty handed after they were disrupted by a taxi driver (9News)

"The group was armed with weapons, they threatened security staff and ultimately stole a number of items," Detective Senior Constable Matt Whelan told 9News.

Both stores were forced to close for hours and some customers were served on the footpath in the CBD.

"The manufacturer will know what phones have been stolen and security measures will be enabled, meaning that these telephones are useless," Det. Snr Const. Whelan said.

"Buying these products you're ultimately causing these burglaries to occur."

Technology experts said the thieves could also be targeting products to sell the spares on the black market.

Customers were served on the street. (9News)

"They'd have reduced value maybe as spares on the black market, so it would be possible to take these devices, pull them apart and there would be useful components within these devices that could then be used in the repair market," Ben Aylett said.