UPDATE: A police helicopter was involved in a dramatic car chase in Gwelup this afternoon resulting in an arrest and one person escaping.
A police spokesman said the five people in a car were evading officers at 2.15pm today.
Police gave chase before the car was dumped near Porter Street with the offenders running away before being caught.
One person was arrested on a return to prison warrant and charged with having a false name.
Three others were arrested before being released without charge.
One other is still on the run and police have downgraded their presence in the area to conduct further inquiries.
Parents of Lake Gwelup Primary school children were advised the school was in a lockdown.
The Education Department advised parents to stay at home until further notice with police asking that the school gates remain closed until all persons of interest were in custody.
More to come.