An arsonist is suspected of lighting three separate fires that destroyed or damaged six vacant townhouses in Brisbane.

Police are hunting an arsonist suspected of lighting three separate fires at a townhouse complex in Brisbane.

Two fires lit on Friday damaged three vacant townhouses at Kuraby.

A fourth townhouse was destroyed, and two others damaged, in another fire on Monday night.

None of the six properties that were damaged or destroyed were occupied.

Forensic officers will examine the scene on Tuesday.