Two small fires have been lit outside the offices of commercial radio station 6PR in East Perth, shortly after a heated on-air discussion about Islam and immigration.

But the station's general manager Barrie Quick and presenters stressed there was no evidence of a link at this stage.

Fire crews were called to the Hay Street building soon after 10:00am to put out the fires outside a storeroom exit and emergency exit at the entrance.

About eight 6PR and 96FM staff were briefly evacuated from the station and no-one was injured.

Mr Quick said he was keeping an open mind about any connection to the morning's contentious debate.

"It was a reasonably robust discussion on air this morning, but as I said it's too early to draw any conclusions and or parallels in relation to that so we'll leave that to the appropriate people to determine that," he said.

6PR will now review its security measures.

"Very scary indeed," Mr Quick said.

"But I guess we live in an age where these things do happen and we need to take all precautions."

Broadcaster Jo McManus was on-air when the alarm was sounded.

"We left the studio, we came down the stairs," she said.

"It was a little bit scary because we got into the fire escape and we could smell the smoke."

She said listeners had contacted the station to express their disagreement with some of the points made in the discussion but there was no suggestion the fires were linked.

"I hope it wasn't connected to that because that would be very disturbing," she said.

"I was expressing a view that we need to calm down and stop worrying so much about Islam and look more at nut jobs that are running around the place.

"And a lot of people don't agree with me."

Perth fire station officer Darren Martin said one of the fires was already out when they arrived and they put the other one out with a hose reel.

"It looks like there was some rubbish that burnt in the two spots," he said.

The building also contains offices for The Financial Review, the Department of Housing and the website WA Today.