Police are seeking information regarding suspiciously lit fire in Webberton on March 6

The suspicious blaze in Webberton on Sunday that tore through several businesses now has a damage bill of more than $750,000.

Investigators had initially assessed the damage from the March 6 fire, which occurred on the corner of Anderson and Dwyer streets, at around $600,000.

Police have appealed for information, reminding the public that a $25,000 reward is on offer for anyone who helps identify and convict an arsonist.

Just before 6pm, dozens of firefighters raced to the scene, where it took them about two hours to extinguish the blaze.

A Department of Fire and Emergency Services spokeswoman said its initial report deemed the fire deliberate, prompting police involvement.

Geraldton Detectives are now investigating the case, with the help of the arson squad from Perth and the local forensic team.

Detective Sergeant Simon Harrison told ABC radio on Monday the fire appeared to have been started outside on Dwyer Street and from there, strong winds caused the blaze to easily spread to sheds and storage units on Anderson Street.

He said one of the sheds had expensive 3D printing machines in it.

Det-Sgt Harrison said it was possible the initial ignition point for the fire was on the verge where there was a bunch of branches and leaves.

He said officers had doorknocked in the area in a bid to collect CCTV footage.

Detectives are keen to view CCTV or dashcam footage from the area during a 20-minute window on Sunday evening – between 5.50pm and 6.10pm.

Detective Senior Constable Kaillen Clark said the police investigation was ongoing as witnesses were being interviewed.

“We have a few witnesses from triple-0 calls. The CCTV footage has been beneficial but is still being reviewed,” Det Sen. Const. Clark said.

WA Police are offering a reward of up to $25,000 to anyone with information resulting in the identification and conviction of an arsonist.

Anyone with information or relevant footage can call Crime Stoppers on 1800 333 000 or make an online report at www.crimestopperswa.com.au.