Police are asking people to avoid the area.
Police said at 1:23 pm on Saturday 18 January
‘A 100m cordon is in place outside a property in Fleet Street, Holbeach, as a hand grenade is believed to be located in a garden.
‘Explosive Ordnance Disposal have been contacted. Please avoid the area until advised, while the incident is brought to a safe conclusion.
‘Incident 178 of 18 January.’