Detectives are investigating after a 15-year-old girl on a Saturday morning jog was assaulted in Mt Lawley.
Police said the girl was jogging near the alley way between Second Avenue and Third Avenue about 8:40am when she was approached by a man.
Police said the man assaulted the girl and verbally threatened her before she screamed and managed to run away to safety.
Police searched the area, looking for a man described as light skinned, 185cm tall with grey hair and wearing white tee-shirt, white pants and no shoes.
Anyone who may have seen or heard the incident are asked to Crime Stoppers on 1800 333 000 or report online to www.crimestopperswa.com.au