Boy to be charged after weapons threats

A 10-year-old boy will be charged after he walked into a Canberra school yard and threatened students and staff with a pruning saw and steak knives, police say.

The boy, who is not a student at the school, walked into the grounds of St Francis of Assisi Primary School in Calwell, in Canberra's south, about 1pm (AEST) on Wednesday, police allege.

He then threatened students and teachers with the pruning saw.

"The school implemented a lockdown procedure to ensure the safety of students," police said in a statement.

Teachers spoke with the boy and took the saw from him. He then produced two steak knives and demanded money from a teacher.

Police arrived a short time later and took the boy into custody. He was later released into the care of his mother.

Police say they are yet to determine the exact charges the boy will face when he is summonsed to appear in court at a later date.