Northumberland Fire and Rescue Service received a call about a fire in the garden of a property on St Michael’s Lane just before 4.30pm.
The Alnwick fire crew attended and dealt with the situation. A fence and patio furniture was damaged in the blaze.
The fire service also asked Northumbria Police to attend after raising concerns about how it may have started.
A Northumbria Police spokesperson said: “We can confirm we received a report from the fire service about a fire in the garden of a property on St Michael’s Lane in Alnwick.
"Nobody was injured but there was some damage to garden furniture.”
The spokesperson added: "Enquiries are ongoing to establish if any criminal offences have been committed."
Anyone with information about the incident is asked to contact Northumbria Police through its website quoting log 789 22/06/21.