Firefighters were called to another suspected arson last night (Wednesday).
They went to the incident off Water Lane at9.31pm.
A North Yorkshire Fire & Rescue Service spokesperson said: “A crew from Acomb responded to reports of a fire in the open.
Water Lane, York
“This was found to be a fire consisting of a push bike and petrol can and was out on crews arrival.
“The cause is believed to be deliberate.”
There have been a series of deliberate fires in the Clifton Backies nature reserve next to Water Lane in recent weeks.
Firefighters tackled two on Sunday alone.