Criminal gangs have been operating in both Milford and in Manorcunningham, but gardaí say that all property owners in the county should be on the look-out for thieves in their area.
The highly-mobile gangs target rural and empty properties.
A cement mixer valued at more than €300 was stolen in Labbadoo while thieves caused €1,50o worth of a damage when they attempted to break into a shed at Drumbarnett, Manorcunningham.
The Manor incident follows reports of suspicious activity in east Donegal in recent days.
The communities there are being warned to be extra vigilant, check on elderly neighbours regularly and be mindful that thieves are also operating during daylight hours.