The youths moved on to Salisbury St, Grantham said, smashing another car’s light. A witness confronted them but was chased off when the youths brandished their weapons, threatening them.
Police caught the pair on Trafalgar St and they have been referred to youth services.
Grantham asked families and communities to “role appropriate behaviour” and “lead the way with the right support in place from partner agencies”.
“Many young people and tamariki we work with experience family violence, exposure to drugs and alcohol, truancy, mental health problems and neuro or learning disabilities,” Grantham said.
“Wrap-around support for young people and their families to address these risk factors is crucial.”