Residents across West Norfolk are being urged to be vigilant following four burglaries in the borough in just a few hours.
Detectives say the raids, which all happened on Wednesday, may be connected, and have urged anyone who may have information about them to come forward.
They have also called for householders to be on their guard against cold callers and to look out for elderly neighbours.
The first raid happened in Croft Road, Upwell, between 11.30am and 12.30pm. There, burglars entered an insecure property and stole laptop computers, an iPad and a camera.
A man in his 80s was then targeted at his home in De Warrenne Place, Castle Acre, between 2.30pm and 3.45pm.
While he sat in his garden, leaving the door open, the raiders entered and stole cash and jewellery from inside.
Then, sometime between 3 and 5pm, a man entered an open property at Castle Cottages, Thornham, telling the elderly resident he needed to check the water supply.
His accomplices are believed to have then entered the home and taken money.
And a man in his 70s was shaken, but unhurt, when he was confronted by raiders at his home in Clarence Road, Hunstanton, shortly before 5pm.
The resident had discovered a man in his hallway, who again claimed he needed to check the water supply.
When the occupier asked him to leave, he was confronted by two other men, who stole a small amount of cash.
Anyone with information about any of the incidents is asked to contact Lynn CID, via the non-emergency 101 number.
Witnesses can also call Crimestoppers free and anonymously on 0800 555111.