Police arrested a 17-year-old after cigarettes and money were stolen from a Monks Road convenience store.
People nearby said a number of police cars and vans had rushed to the scene and closed off a section of Fredrick Street at around 9.30pm on Sunday, December 17.
The robbery happened at the Moonlight Shopper store.
Lincolnshire Police said a 17-year-old male was arrested in connection with the incident.
He remains in custody at the time of writing.