South Yorkshire firefighters were called out to several incidents across the area overnight.
Crews from Cudworth were called to a tree alight on Beevor Street, Hoyle Mill, Barnsley, on Thursday, at about 7.30pm.
A fire also caused damage in a bin chute at a residential complex in Barnes Court, Sheffield city centre, at 8.15pm that night.
Arsonists set fire to some bushes in Middleton Road, Clifton, Rotherham, at 9.45pm that night.
Yobs also set fire to a Saab car in Dryden Road, Southey Green, Sheffield, at 11.20pm.
Firefighters from Elm Road station attended.