Tools and equipment worth more than £20,000 have been stolen from an industrial estate in Castledawson, County Lononderry.
Thieves broke into a commerical yard at Bellshill Road between 1100 GMT on Wednesday and 1400 GMT the next day.
The items stolen included a Stenhoy generator valued at £6,500 and a Wadkeen sheet saw valued at £5,500.
Computers valued at £3,000 and hand tools worth about £6,000 were also taken.
The thieves moved the firm's forklift during the incident, and detectives in Magherafelt are keen to hear from anyone who saw suspicious activity in the area.
They can be contacted on 0845 600 8000.