A Perth bar has been targeted for the second time this week in a suspected arson attack.

Fire crews attended the blaze at Voyeur Bar at Subiaco at around 4am today.

They arrived to find several small fires inside, estimated to have caused $100,000 damage.

Nobody was injured but it did spark an evacuation of nearby businesses, including Nova Radio ,which had to delay its breakfast show due to heavy smoke.

“We’ve had to air out the studios, it’s a real toxic smoke as well,” Nova host Nathan Morris said.

“I just can’t believe someone’s done the Voyeur Bar again.”

On Saturday, two men were captured on CCTV smashing through the back day and pouring accelerant before setting the building alight.

The bar is co-owned by Adultshop boss Malcolm Day and entrepreneur Zhenya Tsvetnenko.

Police said no arrests have been made and investigators would work to determine if there is a connection.

Anyone with information is being urged to call Crime Stoppers on 1800 333 000.

© Nine Digital Pty Ltd 2018

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