Eight women and four men were arrested for allegedly setting classrooms on fire and damaging 15 computers during service delivery protests in Bona-Bona, North West police said on Saturday.

Brigadier Thulani Ngubane said the 12 people faced charges of arson, public violence and malicious damage to property.

They allegedly placed two gas cylinders in two separate class rooms on Wednesday.

"They opened them and set the classrooms alight... the staff room caught fire from the two classes and 15 computers which were in the room were badly burnt," said Ngubane.

They also set alight three water tanks.

The residents were protesting over poor service deliver in the area.

The 12 were expected to appear in the Ganyesa Magistrate's Court on Monday.