Arsonists targeted a bin at a popular leisure spot and a post box.
Firefighters were called to a bin on fire outside the cafe at Corby Boating Lake and a fire in a post box in Wood Street, Kettering, last night.
A crew from Corby Fire Station used a hose to put out the bin, which was destroyed in the fire at about 9.45pm.
Firefighters from Rothwell Fire Station were called to the post box at about 8.45pm but the fire was out when they arrived.
Royal Mail were informed of the fire.
The fire service said both fires were started deliberately.