Police have released CCTV footage of two female robbers wielding a knife and a meat cleaver during a raid on a post office.
The pair used a milk crate to jam open the shutters at the premises in Haunch Lane, Kings Heath, Birmingham, shortly before 10pm on Sunday June 4.
Staff members were forced to open the tills and the offenders snatched handfuls of notes before escaping.
Detective Constable David Cockbill, who is leading the investigation, said: "No injuries were reported despite the use of weapons. However, the staff members have understandably been left very shaken by what happened.
"We take all incidents of this nature seriously and we are doing all we can to trace those involved. As part of the investigation we've examined CCTV and audio of the incident and we are confident the two suspects are female.
"We have chosen to release the clip to the public in a bid to help us identify the two people responsible."
Crimestoppers can be contacted anonymously on 0800 555111.