Police are calling for the public's help to find the people responsible for a robbery at a Bibra Lake scrap metal yard.
Two men were approached by a 46-year-old attendant at the Howson Way yard at 10.30am on August 6.
"One of the men grabbed the attendant by the throat and held him while the second one went into an office area and stole a backpack containing cash," a police spokesman said.
"They both left the premises and are believed to have driven off in a black vehicle, possibly a sedan."
The Regional Investigations Unit is investigating the robbery.
The offenders are described as aged between 20 and 35 years old and both have a dark complexion and medium build.
One is 180cm tall and has black hair and a full beard and was wearing blue work pants and a high-visibility long-sleeve work top and gloves.
The other offender is 175cm tall and was wearing similar clothing to the other offender.Anyone with information about the offence is asked to call Crime Stoppers on 1800 333 000