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.
More top news
A driver has been jailed for ten months for dangerous driving and other offences in Northumberland.
Police are appealing for information after a 22-year-old woman was robbed by the roadside near Stokesley.
Newcastle Council leader Nick Forbes says the city could take children from the Calais Jungle migrant camp in the next couple of years.