Intruders broke into a house in Clay Lake over the weekend and stole a hi-fi system and table lamp, while cash and a mobile phone were taken from a house in Alexandra Road on Monday morning.
Another burglary at a house in Commercial Road on Monday night saw someone get in through an unlocked door and steal a handbag.
Also on Monday night, two men were disturbed while breaking in to a caravan in Pinchbeck Road but nothing was stolen.
Then on Tuesday at about 5.20am, a man was disturbed while trying to break in to a building in Cowbit Road but again nothing was stolen.
Community policing inspector Jim Tyner said: ‘These incidents form part of a series of crimes in Spalding and Operation Bonus is in place to tackle these.
“I have officers on patrol every night looking for burglars but it’s vitally important for people to call us at the time if they see something suspicious.”
Operation Bonus was launched in August after a tide of burglaries at homes and other buildings in Spalding, with a number of arrests and charges being made.
Shortly after its launch, Insp Tyner said: “Officers have been carrying out high visibility and plain clothes patrols in cars, on bicycles and on foot.
“They have been utilising their stop and search powers and this has yielded some significant results.
“Inevitably, many of the people that we stop and search are law-abiding members of the community going about their lawful business and I am sorry for any inconvenience caused to them.
“However, stop and search is an important weapon in our fight against crime.”
Meanwhile, two burglaries have also been reported in Sutton St James over the weekend.
A farm at White Cross was targeted between 8pm on Saturday and 1.25am on Sunday but before that, two men were disturbed while breaking in to a garage outside a house in Chapelgate at about 11pm on Friday.
Inspector Tyner said: “These are not linked to the burglaries in Spalding and it is much more likely that the offenders had access to a vehicle.
“If you saw anything suspicious over the weekend, please give us a call.”
Anyone with information should call 101 or Crimestoppers, anonymously, on 0800 555 111.