Guernsey Police are warning islanders to make sure their homes and outbuildings are locked, following two break ins this week.
Unsecured premises in both St Peter Port and St Saviours were targeted.
Police say the new Elizabeth College annexe off Upland Road was entered on either Sunday 3 April or early on Monday 4.
Graffiti was sprayed throughout the building and a power drill was taken.
Police believe the intruders got in through an unsecured boundary fence.
Around the same time, a private home in St Saviours was targeted, and Police say outbuildings and sheds were entered, although it's not clear if anything was taken.
Guernsey Police say people can take preventative measures.
"We would like to remind members of the public to ensure that they secure their belongings and any items on their property.
The use of private CCTV, security lighting as well as keeping sheds, outbuildings and garages securely locked and windows closed to prevent any access, will detect, deter and help prevent opportunistic thefts."
User pays when Guernsey roads have to close
Channel Islander abandons Bordeaux as the flames 'arrive at the city's gates'
Annual Guernsey Scarecrow Festival set to raise thousands for charity
Channel Islands face 'physical' Poland test
Baby born on Guernsey's Marine Ambulance
New interim leader for Guernsey's healthcare system
Guernsey's reservoir levels falling after prolonged dry spell
Guernsey's Commonwealth flag carrier in early Games win
