Around 50 cars destroyed in suspected Brisbane wrecking yard arson attacks

Fires that destroyed around 50 cars at two vehicle wrecking yards on Brisbane's northside are being treated as suspected arson attacks.

Police say the fires on Beams Road, Fitzgibbon, and on Sandgate Road at Boondall, occurred within 20 minutes of each other late on Friday.

Several houses on either side of the Boondall business were evacuated and both blazes caused road closures.

More than 40 cars were destroyed at the Boondall yard and around seven at Fitzgibbon.

Both businesses will be guarded by police overnight with fire investigators and scenes of crimes officers attending on Saturday.