A man who was armed with a crowbar stole around £600 from a Post Office in Lavenham.
The armed robbery happened at about 11.25am on Friday at the Post Office inside the visitor information centre in Lady Street.
The man, who was dressed in dark clothing, gloves and a black balaclava, entered the Post Office and demanded money.
A spokesman for Suffolk police said the man stole about £600 and left in a grey or silver Seat car.
Anyone who has dashcam footage or information that could help detectives with their inquiries is being asked to contact Suffolk police, quoting crime reference number 37/48339/22.
Alternatively you can contact the independent charity Crimestoppers anonymously on 0800 555 111.
A Post Office spokeswoman said: "Post Office can confirm there was an armed robbery at Lavenham Post Office on Friday. The people who run our branches provide important services to local communities.
"We will be supporting the Police in their efforts to apprehend those responsible for this robbery.
"Post Office would urge anyone with information to contact the police or Crimestoppers anonymously on 0800 555111.
“We are working with the operator to restore service as soon as possible.
"In the meantime alternative branches include High Street (Acton), Monks Eleigh, Cockfield and Long Melford which normally operates Lavenham Post Office.”
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here