ARMED police officers have been deployed in town this afternoon - as part of an ongoing operation.
Lincolnshire Police say further details cannot be provided for tactical reasons at this point.
The incident occurred in the Skirbeck Road area.
Insp Phil Clark said: “No shots have been fired and we aim to keep disruption to a minimum for local residents.
“We apologise for any inconvenience caused whilst we conduct our enquiries and will provide further information as soon as possible”.