CCTV of two masked people has been released as police investigate a series of suspicious fires targeting the same business in northern Queensland.

The first fire was reported at the rear of a tobacconist in Celeber Rd, Andergrove, Mackay, about 4.40am on January 13.

WACTH THE VIDEO ABOVE: Four suspicious fires spark CCTV appeal in Andergrove

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The blaze was extinguished a short time later and a crime scene declared.

Police said a second fire was reported at the same location on February 14.

Officers were notified about 7.50am a fire had occurred several hours earlier but had been extinguished before they arrived.

CCTV shows two unknown people wearing masks and gloves near the business, with one person dressed in a black and white checkered shirt.

Two masked figures caught on CCTV as police investigate a series of suspicious fires. Credit: Queensland Police

CCTV shows smoke and flames as the fire is started. Credit: Queensland Police

CCTV shows an explosion as the fire is started. Credit: Queensland Police

A third fire was reported between 4.45am and 6am on February 18, causing minor damage before it was brought under control.

Two unknown people were sighted near the blaze running towards Parkview Ct, police said.

A fourth fire was reported between 11.50pm on February 27 and 12.10am on February 28, spreading to neighbouring businesses before emergency services extinguished it.

No one was physically injured in any of the incidents.

Police are appealing to anyone with information or relevant vision to come forward as investigations continue.