A 31-year-old man has been arrested in connection with an armed robbery at a post office in Colney Heath.
On Friday, June 14 the High Street store was robbed at knife-point.
At about 3.50pm a man entered the High Street store with a knife and told a member of staff to put money into a bag, which he then left the shop with.
Hertfordshire Constabulary would not release details of how much money was taken as an investigation is currently taking place.
The man, who has not been charged, has been released on bail until July 4.
Anyone with information is asked to contact Hertfordshire Constabulary on the non-emergency number 101.
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