Regional Investigations Unit detectives are calling for the public’s assistance in their investigation of a violent armed robbery offence in Perth on Friday 23 March 2012. At about 9:00pm, two women were locking up a Beauty Salon in Hay Street Perth when a person armed with a knife entered the salon. The offender threatened the women demanding they hand over money. The offender forced the women into a room, turned off the lights and closed the door whilst rummaging through the store before fleeing with a sum of money. The offender was wearing dark clothing with a stocking or beanie over their face. It is not known if the offender was a man or woman. Police are asking anyone who saw the incident or has any information regarding the incident to contact Crime Stoppers on 1800 333 000.