ATASCADERO, Calif. -- Atascadero police arrested a firearm brandishing suspect on Monday afternoon. On Monday at around 1:50 p.m., Atascadero police officers responded to reports of a man with a rifle entering the creek behind the Atascadero Junior High School. Officers arrived on scene and found that the suspect had approached a resident on Capistrano Avenue while holding what they say appeared to be a rifle. Police say the suspect then fled into the creek bed. The Atascadero Junior High School and Atascadero Unified District Office placed a lockdown due to the closeness of the incident. Officers established a perimeter and began a search for the suspect in the creek.