Police investigating a robbery in South Tyneside believe the suspect made off in a vehicle driven by a second man.
Officers received a report at around 11.30am that a man armed with what is believed to be a firearm went into Whitburn Post Office at North Guards in Whitburn.
It's not known whether it was real or imitation at this stage.
He made off with a mobile phone, leaving staff unhurt but shaken.
It's believed the suspect got into a small black car outside the Post Office, driven by a second man, which drove off along North Guards towards Cleadon Lane.
Anyone with information should contact police on 101 or Crimestoppers anonymously, on 0800 555 111.