An 18-year-old man, without clothes, allegedly acted indecently and assaulted several people in a run through the Belconnen Mall on Saturday evening.

Police allege that at about 5.15pm, the man removed his clothing and ran through the mall, assaulting multiple people and acting indecently in the presence of others, including young children.

A short time later, he was restrained by police, security officers and a member of the public.

Asking anyone who witnessed the incident, was assaulted by the man, or has footage should contact police on 1800 333000 or via the Crime Stoppers ACT website.