Crimewatch: Gravesend post office robbery CCTV shown
26 July 2013 Last updated at 20:42 BST
Footage of a violent attempted armed robbery has been featured on BBC Crimewatch.
The attack, captured on CCTV, shows two masked men storm into a post office in Gravesend, Kent, and repeatedly hit a woman with a hammer on 2 July.
Detectives appeared on the BBC One programme on Thursday appealing for witnesses to come forward.