Plundering crooks desperate to get their hands on scrap metal and sell it on for a small fortune have been targeting the area.
Lives were put at risk in the St Ives area when three nine inch cast iron manhole covers were stolen last week. They were taken overnight between Tuesday, August 26, and Wednesday, August 27, from East Street in Colne, Colne Road in Bluntisham and Fairway in Bluntisham.
On the same night in Short Drove, Earith, three two foot by one foot manhole covers were stolen from private land.

Crime reduction manager Julie Collins said: "We are appealing to all residents in these areas to report any suspicious activity around manhole covers.
"If anyone actually witnesses individuals stealing the covers, they should call police on 999."

Businesses in the St Neots area also fell foul of thieves eager to get their hands on copper cabling.
The first theft took place between 4pm on Saturday, August 30 and 6.30am on Monday, September ,1 in Little Paxton Pits.
It is believed crooks cut copper cable that was only partly above the ground and used a vehicle to drag it from the earth, possibly damaging its tow bar as they did so.

The second incident took place at a workshop in St Ives Road, Eltisley, between 6.30pm on Sunday, August 31 and 8am the following day where a total of 40 reels of copper winding wire were stolen.
The thefts come as a St Neots man faces the courts in connection with the theft of cabling which caused hundreds of county homes to have their telephones cut off.

Kevin Smith (22) of Cambridge Road is due to appear in front of Cambridge Crown Court today after being charged with various offences relating to the theft and disposal of cable between September this year and March last year.
He was charged alongside Solly Smith (26) of Kempston Hardwick, Bedford, in relation to thefts which happened in Cambridgeshire villages including Swavesey, Longstanton and Great Gidding.
The St Neots man has been charged with going equipped to steal, fraud, converting criminal property, conspiracy to convert criminal property and attempted theft.

His arrest followed in the wake of Cambridgeshire Constabulary's crackdown on metal theft, Operation Saruman, which police launched last year when it was revealed that the practice was costing the county around £50,000 a month.
Theft of copper telecommunications wiring has seen thousands of homes left without phone lines, while churches, residential homes and schools have had lead stripped from their roofs.

Anyone with information is asked to contact officers on 0845 456 456 4 or Crimestoppers, anonymously, on 0800 555111.