An investigation is underway after a fire damaged a Bella Vista construction site overnight.
Emergency services were called to Solent Circuit at Bella Vista shortly after 7pm, responding to reports of a fire in a basement car park under construction.
The site was evacuated without incident while Fire & Rescue NSW fire fighters worked to extinguish the blaze. There were 10 appliances on site.
While the cause of the blaze is unknown, the fire is being treated as suspicious.
A crime scene has been established and will be examined by specialist forensic officers later today.