Arson Squad investigators are seeking information on a deliberately lit fire that gutted businesses in Innaloo last week.

A Persian restaurant on Scarborough Beach Road was set alight about 1.30am on Friday, June 22.

The fire spread to neighbouring properties and left a damage bill of $750,000.

The blaze caused about $750,000 worth of damage.

Investigators are keen to speak to anyone with information about the blaze.

Rewards of up to $50,000 are on offer for information that leads to the apprehension and conviction of arsonists.

Contact Crime Stoppers on 1800 333 000.