The fire broke out around 4:30 am on January 6 at a strip mall near Kings Canyon Road and Phillip Avenue.
Investigators with the Fresno Fire Department say the fire was started shortly after the suspects broke into Blendz Barber Longue.
The fire spread to O'Sullivan's Sunnyside Lounge and several other businesses, leaving them destroyed or damaged.
RELATED: 2 suspects wanted for starting fire that destroyed several Southeast Fresno businesses
Nearby Sunnyside Deli was also damaged, but firefighters were able to save it.
On Wednesday, Fresno Fire and Valley Crimestoppers announced that a reward for information has increased to $5,000.
Footage of two suspects accused of starting fire at Fresno strip mall
Anyone with information about this fire is asked to call Valley Crimestoppers at (559) 498-STOP (7867).