Authorities are reviewing surveillance camera footage to find out who spray-painted graffiti and gang signs on school buses and at least two schools in DeKalb County.

A maintenance staff worker could be seen early Monday examining Stephenson Middle School, one of the schools vandals targeted over the weekend.

The graffiti was cleaned before students arrived.

Vandals also hit nearby Stephenson High School and at least five school buses, according to Channel 2 Action News.

Police believe the vandals spray-painted the schools and buses Saturday night in front of security cameras, the television station reported.